Math
posted by DrBob222
3x4 to y+15
is constant and
y=3 when x=2
then when
y=12, x equals?
My answer was 13. Im not sure how to solve this question. Could you please go through the steps so I can see they match up with mines.
My Steps:
3xy:y+15 The original problem above says 3x4 and not 3xy. Try it again. I have 7/3 for the answer.
3x12:12+15
3x12:27
1227:3x
39:3x
13:x
I'll try again:
3x4:y+15
3x:12+15+4
3x:31
Now what. Is what I did right?
I need help with this problem.
Given that the ratio of
3x4 to y+15
is constant and
y=3 when x=2
then when
y=12, x equals?
My answer was 13. Im not sure how to solve this question. Could you please go through the steps so I can see they match up with mines.
My Steps:
3xy:y+15
3x12:12+15
3x12:27
1227:3x
39:3x
13:x
The problem said the ratio was a constant when x=2 and y=3
I substituted x = 2 and y=3 and solved for the constant.
(3x4)/(y+15) = k
I found 1/9 for k.
Then I started anew, substituted y=12 and solved for x.
There may be an easier way to do it but I think this will work.
I tried that did I not. I honestly don't understand. Can you please type it out.
Respond to this Question
Similar Questions

math
if (2x3):(y+4)=k where k is a constant and x=4 when y=2 then find x when y=6 What does the : between the factor mean? 
Maths
i have an answer but im not sure if its right would you tell me please and show me the steps of how to work through the question make f the subject 7f5=3g(2f+h) my answer was f=h5/3g5 and i simplified that to f=h/3g thanks for … 
Math
Solve for x: 5/x+6+2/x^2+7x+6=3/x+1 5/x+5+2/(x+6)(x+1)=3/x+1 5(x+6)(x+1)/x+6+2(x+6)(x+1)/(x+6)(x1)=3(x+6)(x+1)/x+1 5(x+1)+2=3(x+6) 5x+5+2=3x+18 5x+7=3x+18 2x=11 x=11/2 or 5 1/2 is my method correct? 
math
1/4x1/6y=2 1/6x+1/5y=4 solve for x and y its suppose to be x equals 12 and y equals 30 need steps thanks 
Basic Math
I forgot how to solve for two variables... Please check if I solved both problems properly! Thank you. Equations: (solve for t and z) 12t + 4z = 80 2t + 4z = 20 My answer: t = 2, z = 14 The steps: (simplified it) z = 20  3t, z = 5 … 
college math
I do not understand a problem from a text book or how to solve the problem for the answer. Could shomeone show me the steps (show work) on how to solve this question. The sum of the intergers from 1 through n is n(n+1)/2. the sum of … 
Algebra
Rewrite 2x  3y ≤ 6 in slopeintercept format. I'm really not sure how to answer this question. Can you please guide me through the steps? 
Physics
I am reviewing for a test and I don't know how to attempt this question. Could someone please work through this problem and then have the general steps that I need to take to solve the question? 
Science
I am reviewing for a test and I don't know how to attempt this question. Could someone please work through this problem and then have the general steps that I need to take to solve the question? 
Math
I just need help to solve these steps. 8 to the 2 power +9(12/ 3*2)7 I know the answer is 129 but I'm not sure of the steps to get to it.