SOLUTION: I am trying to help my 9th grade brother with his homework. He does not have his text book or an example to how to do these problems. I was just plugging in his answers into the eq

Algebra ->  Equations -> SOLUTION: I am trying to help my 9th grade brother with his homework. He does not have his text book or an example to how to do these problems. I was just plugging in his answers into the eq      Log On


   

Question 108425: I am trying to help my 9th grade brother with his homework. He does not have his text book or an example to how to do these problems. I was just plugging in his answers into the equations but know all his answers are wrong and we don't have an example to help us get the right answer.
Here is the question 2x-6y=-16
5x=7y=-18
Please help us!!! any help step by step would be greatly appreciated.
thank you
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
multiply the first equation by 5 10x-30y=-80
now multiply the second equation by -2 -10x-14y=36
now add these two equations
10x-30y=-80
-10x-14y=36
--------------------------
-44y=-44
y=-44/-44
y=1 answer
2x-6*1=-16
2x-6=-16
2x=-16+6
2x=-10
x=-10/2
x=-5 answer.
proof
5*-5+7*1=-18
-25+7=-18
-18=-18