Wednesday
February 10, 2016

Posts by Jai

Total # Posts: 1,926

math
Note that the equation is in slope-intercept form, y=mx+b where m is the slope and b is the y-intercept In the equation y=-1/3x + 3, therefore the slope is -1/3.
March 16, 2015

Algebra
To get the x-intercept, let y = 0 and solve for x: -3x + 4y = -12 -3x + 4(0) = -12 -3x = -12 x = 4 Thus x-intercept is at (4,0) To get the y-intercept, let x = 0 and solve for y: -3x + 4y = -12 -3(0) + 4y = -12 4y = -12 y = -3 Thus y-intercept is at (0,-3) hope this helps~ `u`
March 16, 2015

Maths
Average weight is the total weight divided by the number of people. To find the average weight of boys, we first look for the total weight of all (boys + girls), and the total weight of the girls. Weight of all (boys + girls): 44 * 50 = 2200 kg Weight of girls: 40 * (50 - 40) ...
March 15, 2015

Calculus
Substitute y = 3x - 7 to x^2*y: x^2 * (3x - 7) 3x^3 - 7x^2 Then differentiate with respect to x, and equate to zero (since we're looking for maximum/minimum): 9x^2 - 14x = 0 x(9x - 14) = 0 x = 0 x = 14/9 Note that if x = 0, the minimum product of x^2 * y is zero. But if x...
March 15, 2015

Calculus
*Correction* I'm sorry, the one I did is not called L'hopital's rule. That is just another technique of finding limits (dividing numerator and denominator by the variable with highest degree). L'hopital's rule is different, for it uses separate ...
March 15, 2015

Calculus
lim [ 6x^2 / (200-4x-kx^2) ] as x->infinity = 1/2 Notice that the numerator and denominator has the same highest degree of x. Therefore, we can use the L'hopital's rule. To do this, we divide both numerator and denominator by x^2: lim [ (6x^2 / x^2) / (200-4x-kx^2)/...
March 15, 2015

Algebra
(1) Yes (2) Yes (3) Hmm how did you arrive with your answer, because I'm getting, = 70 + 40 + 2(30 + .29) = 110 + 2(30.29) = 110 + 60.58 = 170.58 or perhaps there is typo or missing info? And I'm also curious with your use of 'm' units.
March 15, 2015

Physics
P,abs = P + pgh P = (1.01*10^5 Pa) + (1025 kg/m^3)*(9.8 m/s^2)(15 m) P = 101000 + 150675 P = 251675 Pa Check the significant figures. Hope this helps~ `u`
March 14, 2015

Calc
∫ (2x+1)/(x+1) dx We can separate this term into two terms by taking each term in the numerator: ∫ (2x)/(x+1) + 1/(x+1) dx For the term on the right, ∫ 1/(x+1) dx = ln |x+1| For the term on the left, Let u = x+1, thus x = u-1, and dx = du Replacing, 2 ∫...
March 14, 2015

Calculus check
Yes, that's right. `u`
March 14, 2015

maths
To get the lateral surface area, simply multiply the base perimeter by the height, 25 cm * 40 cm = ? hope this helps~ `u`
March 14, 2015

chemistry
First, we write the balanced reaction: 2 AgNO3 + K2S -> 2 KNO3 + Ag2S Recall that molarity is moles per liter solution, or M = n/V Then we get the number of moles of K2S by simply multiplying the volume (should be in L units) by the concentration (Molarity has units mol/L...
March 13, 2015

Math
(1) You have to recall some laws of exponents. 15 * 3^(y+1) - 243 * 5^(y-2) = 0 3 * 5 * 3^(y+1) - 3^5 * 5^(y-2) = 0 5 * 3^(y+1+1) - 3^5 * 5^(y-2) = 0 5 * 3^(y+2) = 3^5 * 5^(y-2) 3^(y+2) / 3^5 = 5^(y-2) / 5 3^(y+2-5) = 5^(y-2-1) 3^(y-3) = 5^(y-3) The only number that will ...
March 13, 2015

Math Functions (if i have correct answer)
Max height - yes, we got approximately the same answer Time - the time you got is the time where the ball reached the maximum height. The question asks for the total time (the time the ball is above the surface of Mercury), therefore you should multiply it by 2, so it would ...
March 13, 2015

math
f varies inversely with g: f = k * (1/g) where k is some constant. f=20 when g=4: 20 = k * (1/4) k = 20 * 4 k = 80 f=? when g=10 f = 80 * (1/10) f = 8 Hope this helps~ `u`
March 12, 2015

Algebra
an = ao + (n-1)d where an = the nth term ao = the first term n = number of terms d = difference between two consecutive terms Substituting the given, (i) a6 = 13 (here, n=6, an=13) 13 = ao + (6-1)d 13 = ao + 5d (ii) a10 = 25 (here, n=10, an=25) 25 = ao + (10-1)d 25 = ao + 9d ...
March 12, 2015

chemistry
We write the reaction: HC2H3O2 + KOH -> KC2H3O2 + H2O The products are potassium acetate (salt) and water.
March 12, 2015

chemistry
Assuming the gas is ideal, for a fixed volume of gas, we can use the Gay-Lussac Law, which states that Pressure is directly proportional to Temperature of gas: P = kT where P = pressure k = some constant T = temperature (in Kelvin) If we're given sets of values for ...
March 12, 2015

math
Recall that speed is distance traveled over time: v = d / t Rearranging to get t, t = d / v For the two trips, the distance traveled is the same, while the speed and time of travel are different. We represent each time traveled as such: Let t1 = time traveled (towards Rocky ...
March 12, 2015

Separation processes
If the "low" volatility in the question means it is CLOSE to 1 (not equal to 1), then the answer is letter 'D' or 'separation of components is difficult. If it said "exactly equal to 1", then it's 'B'. But since it doesn't ...
March 12, 2015

help
Because half-life means final amount becomes 50% of original, therefore, after another half-life time, the final amount becomes 25% of original. Well if you look at the problem, all you have to do is multiply the the half-life 12.3 years by 2, which is 24.6 years. But if you ...
March 11, 2015

Math
Represent the unknowns. Let x = length since the width is 3/4 of the length, Let (3/4)x = width Recall that the area of rectangle is just width multiplied by the length, A = w * l Substituting, 432 = (3/4)x * x 432 = (3/4)x^2 432 * 4/3 = x^2 576 = x^2 Get the square root of ...
March 11, 2015

Chemistry help please
Yes, that's right. The oxidation number of P in P2O3 is +3.
March 11, 2015

Math
This problem looks similar to the other math problem posted here. OwO Anyway, first represent the unknowns. Let x = length since the width is 2/3 of the length, Let (2/3)x = width Recall that the area of rectangle is just width multiplied by the length, A = w * l Substituting...
March 11, 2015

Chemistry ( I NEED HELP, PLEASE!!!, IM DESPERATE!)
First, we balance the chemical reaction: 2 Na2O2 + 2 H2O → 4 NaOH + O2 Then, we need to determine the molar masses of Na2O2 and O2 in order to convert them to moles. To get them, we need the mass of each element in the formula and add. In the periodic table, Na = 23 and ...
March 11, 2015

algebra
Note that an object falling freely experiences uniformly accelerated motion (UAM). In this case, we can use the formula, h = vo * t - (1/2) * g * t^2 where h = height or distance vo = initial velocity t = time g = acceleration due to gravity = 9.8 m/s^2 = 32.2 ft/s^2 Since the...
March 11, 2015

english
setting
February 11, 2015

Adverbs
Which words make up the adverb phrase in this sentence? The school bus crosses two bridges along its route. A. along its route B. two bridges along C. The school bus D. crosses two bridges
November 25, 2014

grovment
General public might be swayed by a charismatic leader.
November 25, 2014

intermediate math
Recall that distance is equal to rate (or speed) mutiplied by time: d = v*t Let r = speed of Payton Let r + 4.5 = speed of Angie If they are jogging opposite to each other, then the distance between them is equal to the sum of their rates multiplied by the time: d = r*t + (r+4...
September 29, 2014

chemistry
Recall Boyle's Law: P1 * V1 = P2 * V2 where P1 = initial pressure P2 = final pressure V1 = inital volume V2 = final volume This is applicable if Temperature is held constant. Substitute the given values and solve for P2. Hope this helps~ :)
September 28, 2014

Chemistry- colligative properties
Van't Hoff factor can be associated to the property of the substance (if it's strong electrolyte, weak electrolyte, etc.), and can be approximated by counting the number of ions dissociated in water. a. i ~ 1 (weak acid, therefore weak electrolyte) b. i = 2 (strong ...
September 28, 2014

Physics
Formulas we need (uniformly accelerated motion): h = vo*t - (1/2)gt^2 vf^2 - vo^2 = 2gd Let H,t be the height of tower. The first stone thrown upward reaches its maximum height, h,max = vo^2 / 2g h,max = 15^2 / 19.6 h,max = 11.4796 meters (above the tower) and the time needed ...
September 28, 2014

mathematics
A bag contains 10 red, 15 white, 25 green balls. What should be the minimum number of balls drawn without replacement so that you get 5 red, 3 white, 10 green balls.
September 9, 2014

college algebra
A large rectangular movie screen in an IMAX theater has an area of 7200 square feet. Find the dimensions of the screen if it is 10 feet longer than the width.
September 6, 2014

Calculus
f(x)=sqrt(x^3+2) We can also rewrite this as, f(x) = (x^3 + 2)^(1/2) Then we can use chain rule, f'(x) = (1/2)*(3x^2)*(x^3 + 2)^(-1/2) Finally, the second derivative is f''(x) = (3/2)(2x)(x^3 + 2)^(-1/2) + (3/2)(x^2)(3x^2)(-1/2)(x^3 + 2)^(-3/2) And simplify. Hope ...
May 16, 2014

geometry
Recall the Pythagorean theorem: c^2 = a^2 + b^2 where c is the hypotenuse (which is also the longest side of a right triangle) and a & b are the legs. Substitute each side lengths to the equation. Of course the longest side is c, and the remaining sides are a and b. If the set...
May 16, 2014

phys
A boat is traveling upstream at 14 mph with respect to a river that is flowing at 6 mph (with respect to the ground). A man runs directly across the boat, from one side to the other, at 6 mph (with respect to the boat). The speed of the man with respect to the ground is:
February 19, 2014

Math - Check my answer?
Yes that's correct.
January 8, 2014

Math check
1. Actually it's B. Expanding, 2(x - 3) = 2x 2x - 6 = 2x -6 = 0 Note that if you get an answer like this (constant = zero), there is no solution. 2. It's D. (btw I don't know why you put question mark beside 3) Expanding, 3(y - 3) = 2y - 9 + y 3y - 9 = 3y - 9 or 0...
January 8, 2014

algebra
Let A = number of sweets of Alvin Let C = number of sweets of Calvin Let M = number of sweets of Melvin According to the statements, A < C A + C = 31 M = A + 24 Note that to maximize M, A should also be maximized. Maximum value of A is 31 (that is, if C = 0), but according ...
December 30, 2013

geometry
Recall that surface area of cone is SA = pi*r^2 + pi*r*s where r = radius s = slant height Substituting, SA = 3.14 * 15^2 + 3.14 * 15 * 11 SA = 706.5 + 518.1 SA = 1224.6 sq units Hope this helps :3
December 29, 2013

MATHS
Area of disc (circle): A = pi*r^2 A = 3.14 * 7^2 A = 153.86 cm^2 Area of cardboard (rectangle): A = L * W A = 70 * 50 A = 3500 cm^2 Divide area of rectangle by area of circle: 3500 / 153.86 = 22.75 Take only the whole number: 22 discs Hope this helps :3
December 29, 2013

Genius Math
Hmm, the triangle seems impossible, because if you draw it, given the condition that AC = BC (thus it's an isosceles triangle), then angle ACB = 96, therefore BAC = 96 degrees also (since the sides opposite to the angles are equal). So if there are two angles which are 96...
December 24, 2013

Chemistry
When naming alkanes, alkenes, alkynes, yes, it's the longest chain that is first counted. And then identify the groups attached to to. (For instance methyl, ethyl, etc). Then number the carbon in the longest chain, starting from the nearest attached group (if it's ...
December 21, 2013

Mechanics
Recall that Pressure is just Force over a unit Area, or P = F/A We are given the force (which is 220 N), therefore, we only need to find area. A = L*W A = 4*3 = 12 m Therefore, P = 220 / 12 P = 18.33 N/m^2 P = 18.33 Pa Hope this helps :3
December 21, 2013

math
Find the value of df^-1/dx at x=f(a). f(x)=5x+8, a=-1 i got 5?
December 19, 2013

science
That's correct. :)
December 18, 2013

Algebra 1
Let x = weight of chicken in pounds Let y = total cost of x pounds of chicken Therefore, y = 2.99x To see the graph of this, go to wolframalpha . com and type in the equation. Hope this helps :3wol
December 18, 2013

math
f(x) = 7x - 2
December 18, 2013

algebra
Substitute T = 141 to the equation: 141 = –0.005x^2 + 0.45x + 125 Simplify: –0.005x^2 + 0.45x + 125 - 141 = 0 –0.005x^2 + 0.45x - 16 = 0 Recall that discriminant is just D = b^2 - 4ac if D < 0 : imaginary root D = 0 : real, equal root D > 0 : two real, ...
December 18, 2013

Pre-Calculus
*I mean you get all the factors of x = +/- p/q. In the problem, x = +/- 20, and its factors are written there above. The factors are the ones you have to check by substituting them to the expression. :)
December 16, 2013

Pre-Calculus
You use rational root theorem. Let p = constant term Let q = numerical coefficient of highest degree of x x = +/- p/q In here, p = -20 and q = 1. Thus, x = (+/-) 1 , 2 , 4 , 5 , 10, 20 You have to substitute each factor (for instance x = -1) to the expression, and if you get a...
December 16, 2013

Math Quick Question
You spoke to that person for 45 minutes only.
December 8, 2013

Chemistry(DrBob222)
Yes, that's right. :)
December 8, 2013

math
1/13 = 0.0769230769230... The repeating numbers are 076923 (six numbers), thus, 43 / 6 = 7 remainder 1. Therefore counting from zero, the 43rd digit after the decimal point is 0. hope this helps. :3
December 7, 2013

Math
1. No 2. Parallel
December 7, 2013

Math
x + 7 ≥ 3x x - 3x ≥ -7 -2x ≥ -7 x ≤ 7/2 x ≤ 3.5 3x + 4 ≤ 5x 3x - 5x ≤ -4 -2x ≤ -4 x ≥ 2 Therefore, the common solution is from 2 to 3.5, or 2 ≤ x ≤ 3.5 Hope this helps :3
December 7, 2013

algebra
d = 0.05r^2 + r Substitute r = 45: d = 0.05(45)^2 + 45 d = 101.25 + 45 d = 146.25 ft To the nearest foot, d = 146 ft Hope this helps :3
December 7, 2013

math
h(n) = 100 / 9 n Substitute n = 27: h(27) = (100 / 9) * 27 h(27) = 100 * 3 h(27) = 300 dollars hope this helps :3
December 7, 2013

math
12 - q ≥ -13 Just solve it like a true equation: 12 + 13 ≥ q 25 ≥ q or q ≤ 25 Hope this helps :3
December 7, 2013

Chemistry
Formula to be used: Molality = moles of solute / kg solvent Steps: #1. To do this, get the molar mass of Tin, using a periodic table. Fomula for Tin in Sn (look it up in the periodic table, and you'll see its mass). #2. After you get the mass of Tin, divide it by 5 g, and ...
December 4, 2013

Chemistry
*repost* Formula for osmotic pressure: Π = MRT * i where m = molarity (mol solute / L solution) R = universal gas constant = 0.0821 L-atm/mol-K T = temperature (K) i = van't Hoff factor (approximately equal to ionizable ions) Note that sucrose is soluble in water, but...
December 4, 2013

Chemistry
Formula for osmotic pressure: Π = MRT * i where m = molarity (mol solute / L solution) R = universal gas constant = 0.0821 L-atm/mol-K T = temperature (K) i = van't Hoff factor (approximately equal to ionizable ions) Note that sucrose is soluble in water, but does not...
December 4, 2013

Algebra 1
Yes, your answer is correct. :) (I thought at first the radius is 2 and 1/2, not 21/2, but I guess that's too small) :3
December 4, 2013

Geometry
Use Heron's formula. Let a, b and c be the sides of a triangle. Let s = a + b + c Therefore the area of triangle can be calculated using this formula: A = sqrt[ (s)(s-a)(s-b)(s-c) ] It should be a little easy using this formula, so I guess you can do it on your own. :) ...
December 4, 2013

Calculus
limit (sin(4x+12))/(5x+15) as x -> -3 If we try substituting, = (sin(4(-3)+12))/(5(-3)+15) = sin(-12+12) / -15+15 = sin(0) / 0 = 0 /0 Note that 0/0 is indeterminate, and if you arrive at this answer, you use the L'hopital's rule. To use the L'hopital's rule...
December 2, 2013

Physics
You can use the formula for Uniformly Accelerated Motion (UAM): h = (v,o)t - (1/2)gt^2 Or you can use another formula, which does not use time: v,f^2 - v,o^2 = 2gd where v,f = final velocity v,o = initial velocity g = acceleration due to gravity = 9.8 m/s^2 d = distance (in ...
December 1, 2013

math
1. Yep 2. The remaining distance is is 120 - 60 = 60 miles (because the first 60 miles was already covered in 1.2 hours according to #1) Speed is distance over time, or v = d/t Substituting, 40 = 60/t t = 60/40 t = 1.5 hours 3. Yep
December 1, 2013

math
Let x = multiplier. Thus, Men = 7x Women = 5x The ratio of men to women is still 7 to 5. Since there are 440 more men than women, we can say that 7x = 5x + 440 Solving for x, 7x - 5x = 440 2x = 440 x = 220 The total men and women is 7x + 5x = 12x. Thus the total is, total = ...
December 1, 2013

Physics
Steps: 1. Get the volume of the sphere (baseball). You re given the diameter, and you can get the radius by dividing this by 2. You are also given the formula: V,sphere = 4/3 * π * r^3 Just substitute the value of radius to get V. 2. Divide the given mass by volume to get...
December 1, 2013

Physics
If you use the equation for heat released/absorbed to support your explanation, Q = m*c*(T2 - T1) where m is the mass, c is the specific heat capacity and T is the temperature. Since the only substance involved is water, c is the same for both systems. We can also say that the...
December 1, 2013

Physics
Because ice can absorb more heat from the soft drink to change its state from ice to water (latent heat), than water only. If you use the equation for heat released/absorbed, Let T2 = final temperature of ice (assume it's above 0°C, so it became water at some temp >...
December 1, 2013

Math
y = (1/2)x^2 - (3/2) -> this is a parabola differentiate: dy/dx = (1/2)*2*x - 0 dy/dx = x The line 4x - 8y = 5 has a slope of, -8y = -4x + 5 y = (1/2)x - 5/8 slope = 1/2 If this line and the tangent line of the parabola are parallel, they have the same slope: dy/dx = x 1/2...
December 1, 2013

Physics
Because it absorbs heat change its state from liquid to gas. This is called the latent heat, and it is a constant-temperature process. If the temperature changes without changing the state of a substance, it is called sensible heat. Hope this helps :3
December 1, 2013

Math
2a^2 b^3 (4a^2 + 3ab -ab) Distribute to each: 2a^2 b^3 * 4a^2 = 8a^4 b^3 2a^2 b^3 * 3ab = 6a^3 b^4 2a^2 b^3 * (-ab) = -2a^3 b^4 Adding them, 8a^4 b^3 + 6a^3 b^4 -2a^3 b^4 = 8a^4 b^3 + 4a^3 b^4 Actually either there's no answer in the choices, or there is a typo. :3
December 1, 2013

algebra 1
Um, I think I answered the same question before.. but probably I didn't explain it clearly. :3 First thing we know is that the boiling temperature of water is dependent on the altitude. We can let x as the altitude (independent variable) and y as the boiling temp (...
December 1, 2013

Math
Yes. :) The equation containing (2,4) with slope equal to -2 is y = -2x + 8.
December 1, 2013

Math
Is this the continuation of your question? :) In the previous question, we know the slope is -2, and therefore we use the point-slope formula to get the equation: y - y1 = m(x - x1) We only need the slope and one point to get the equation. Let's use the point(2,4). ...
December 1, 2013

PreCal
^No, I'm sorry don't mind my post ^^;
December 1, 2013

PreCal
2yi = 5x - 2i + 4 Divide everything by 2i to get y alone: 2yi / 21 = (5x - 2i + 4) / 2i y = (5/2i)x - 1 + 2/i Hm, I think there's a typo..
December 1, 2013

Math
There are actually infinite number of possible point B here, because if point A and point B lie on a line with a slope of -2, then two different points on that line have can be connected with a line of slope equal to -2. (I hope that's clear ^^;) But just to show how to ...
December 1, 2013

Math
1. Yep 2. Yep 3. Yep 4. Yep 5. Yep 6. Yep 7. Yep 8. Yep
December 1, 2013

MATH
Gemma: the first and second ordered pairs Tessa: the third and fourth ordered pairs I think you can observe them easily. hope this helps :3
December 1, 2013

MATH :)
They are all correct, except #5. 1.30 x 10^4 has three significant figures (1,3 and 0). hope this helps :3
November 30, 2013

Chemistry
Get first the number of moles (n) of each species. To get the moles, divide the mass by the molar mass. To get the molar mass, get a periodic table and add the individual mass of the elements in the chemical formula. H2O (water): 2*1 + 1*16 = 18 g/mol C3H8O3 (glycerine): 3*12...
November 29, 2013

Chemistry
Get first the number of moles (n) of each species. To get the moles, divide the mass by the molar mass. To get the molar mass, get a periodic table and add the individual mass of the elements in the chemical formula. H2O (water): 2*1 + 1*16 = 18 g/mol C3H8O3 (glycerine): 3*12...
November 29, 2013

Math
64 x 6^4 = 2^6 * 2^4 * 3^4 = 2^10 * 3^4 = 82944
November 27, 2013

math
Let n = number of laptops sold 5 / 9 = 20 / n 5n = 9 * 20 5n = 180 n = 36 laptops
November 27, 2013

algebra 1
You can observe that the difference between two consecutive numbers in the pattern is 9.
November 27, 2013

Chemistry
I think you lack data, and thus, this question cannot be answered.
November 27, 2013

Chemistry
Molar mass of SO2 = 64 g/mol Divide the given mass by molar mass to get the moles: n = 0.7 / 64 n = ? Now solve for n.
November 27, 2013

Calculus
Integral of x / sqrt(x-1) dx We can use substitution method. Let u = x - 1 Thus, x = u + 1 and dx = du Substituting, Integral of (u+1)/sqrt(u) du Integral of (u+1)(u^(-1/2)) du Integral of u^(1/2) + u^(-1/2) du = (2/3)*u^(3/2) + (2)*u^(1/2) + C = (2/3)*(x-1)^(3/2) + 2(x-1)^(1/...
November 27, 2013

Algebra
Just substitute x = -3 to the function: f(x) = 3x - 10 f(-3) = 3(-3) - 10 f(-3) = -9 - 10 f(-3) = -19 Hope this helps :3
November 25, 2013

math
x = (2/y^2) + 2 Place the 2 from the right side to the left side. x - 2 = 2 / y^2 Multiply both sides by y^2. (x - 2) * y^2 = (2 / y^2) * y^2 (x - 2) * y^2 = 2 Divide 2 from the right side by x - 2 to isolate all terms with y. y^2 = 2 / (x - 2) Finally, get the squareroot. y...
November 24, 2013

math
Let n = total number of students. It was said that 60% of n are girls, which is according to the problem, equal to 30. Thus, 60% * n = 30 Note that 60% is also equal to 0.6 in decimal form: 0.6 * n = 30 n = 30/0.6 n = 50 students Hope this helps :3
November 24, 2013

Chemistry
To do this, you need the the latent heat of vaporization (Lv) for water. In references, the Lv for water is 2256 J/g. The formula for the heat released of absorbed is Q = m * Lv where m = mass Lv = heat of vaporization In this case, heat is released (negative Q) because the ...
November 24, 2013

Chemistry
To do this, you need the the latent heat of vaporization (Lv) for water. In references, the Lv for water is 2256 J/g. The formula for the heat released of absorbed is Q = m * Lv where m = mass Lv = heat of vaporization In this case, heat is released (negative Q) because the ...
November 24, 2013

Pre-Calc (Prove the identity)
Recall that formula for sum in tangent: tan (a +/- b) = [tan(a) +/- tan(b)] / [1 -/+ tan(a)tan(b)] Applying this, tan^2(x/2 + π/4) = { [tan(x/2) + tan(π/4)] / [1 - tan(x/2)tan(π/4)] }^2 Note that tan(π/4) = 1, so = [(tan(x/2) + 1) / (1 - tan(x/2))]^2 = (tan...
November 24, 2013

Math grade 9 and up
x/s + y/w = 1 s/x + w/y = 4 You can use substitution. From the first equation, wx + sy = sw x = (sw - sy)/w Substitute to the second equation: s/x + w/y = 4 sy + wx = 4xy sy + (w)((sw - sy)/w) = 4((sw - sy)/w)y sy + sw - sy = 4y(sw - sy)/w sw^2 = 4swy - 4sy^2 4sy^2 - 4swy + sw...
November 23, 2013

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