# Algebra 2

posted by .

I know that were doing problems were there is a soultion given which is equal to X^? times a constant ...

y = k x^?

So this is problem I have to decide given a probelm x relationship to y (for example iverse square cube and so forth) this unkown variable is denoted witha (?)

So given two points (Q,W) (E,R) how do I determiine the relationsip of x to y... and solve for the (?)

I guess so far in my book the constant is raised to the first power is there any way I could find out if the constant is not raised to first power or not???

Once I come up with the formula I know how to do the rest I just don't know how to obtain the formula and solve for the (?) once you do it's just plug and chug...

so please show me how to solve for (?) given two points

• Algebra 2 -

y = kx?
Substitute the x and y value, then take the log of both sides.
log y = k*?*log x

• Algebra 2 -

can you show me how to do this with the points

(2, 5)
(6, 80)

• Algebra 2 -

Two points determine a line. Given two points (Q,W) and (E,R), you can find the equation of the unique line, y = m x + b that goes through those two points.
Three points determine a parabola, y = a x^2 + b x + c
Four points determine a cubic, y = a x^3 + b x^2 + c x + d
etc
Now
given (Q,W) and (E,R)
slope = m = (R-W)/(E-Q)
so now you have m
go back and put first point in to get b from b = y - m x = W - m Q

• Algebra 2 -

ok
m = (80-5) / (6-2)
m = 75/4
then
b = 5 - (75/4)2
b = 5 - 75/2
b = (10-75)/2
b = -65/2
so
y = (75/4)x -65/2
or
4 y = 75 x - 130

• Oh, use Dr Bob's answer -

I did not understand that your question related only to direct variation until I saw Dr. Bob's answer.

## Similar Questions

1. ### Math

In a mixed number or fraction problem, you have dividing and multiplying. Now if you were given a list of multiplying and dividing mixed number and fraction word problems, how can you tell the difference between multipling and divinding …
2. ### Math

I have 2 problems I need help with both I have narrowed it down to 2 possible answers but can't decide which one is right. The first problem log subscript 5 (2x+3)=2 the choices a)13/2 and b) 14. The next problem 8^x = 16^x+2 the choices …
3. ### Algebra problems

I have some problems that I would like checked please. Find and simplify the difference quotient f(x+h)-f(x)/h, h can not equal 0 for the given functions. 1. f(x)=x^2+3x+9- I got 2x+h+3 Evaluate the piecewise function at the given …
4. ### Calculus

Given two problems: Problem A: Tau = Integral(0 to v) v/(q^2 - v^2) dv q = constant Problem B: Tau = Integral(V TO 0) v/(q^2 - v^2) dv q = constant Why is it that, SUBSTITUTION RULE is used in problem A, and QUOTIENT RULE is used in …
5. ### statistics

in a classic study of problem solving, katona demonstrated that people whoa re required to figure out a problem on their own will learn more than people who are given the solution. One group of participants is presented with a series …
6. ### For Hellpp - Algebra 2

I removed your original post because of an inappropriate name. Please -- in the future do not string out your name across the page. _________________________________ Homework Help Forum: Algebra 2 Answer this Question | Responses Posted …
7. ### AP Physics

can you please explain this to me... Were given this eqaution x = At^2 + B were A = 2.10 m/s^2 B = 2.80 m ok and this is an example problem and it's wlking us through it find the instantaneous velocity at t=t2=5.00s equlas the slope …
8. ### AP Calculus AB (Algebra Review)

Show that if |x + 3| < 1/2, then |4x + 13| < 3. I have no idea how to do this. I thought I might have to use the triangle inequality thing but that got me no where for the first equation I got a soultion of (-7/2, -5/2) and for …
9. ### Algebra

I have this math probelm z-(3z)/(2-z)=(6)/(z-2) in my book it says to solve the equation. I have worked this problem many times and I keep comming up with different answers. When I use an online calculator to check my work it is giving …
10. ### Algebra 1

Algebra 1 help please :( Use the point-slope from linear equation given to complete the following problems.... y+4=-4(x-2) 1. What is the slope of the given line?

More Similar Questions