SOLUTION: I'm having trouble with System of Linear Equations by Substitution. One of the problems I need help is, "Solve the linear system using substitution" -5x+3y=51 y=10x-8 ---

Algebra ->  Coordinate Systems and Linear Equations -> SOLUTION: I'm having trouble with System of Linear Equations by Substitution. One of the problems I need help is, "Solve the linear system using substitution" -5x+3y=51 y=10x-8 ---      Log On


   

Question 556061: I'm having trouble with System of Linear Equations by Substitution.
One of the problems I need help is,
"Solve the linear system using substitution"
-5x+3y=51
y=10x-8
------
What I did is
-5x+3y=51
y=10x-8
-5x+3(10x-8)=51
-5x+30x-8=51
25x-8=51
25x=75
x=3
and my answer is (3,51)
I don't think it's correct.


Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
You have x = 3 correct, but y = 51 incorrect.

y = 10x-8

y = 10(3)-8

y = 30-8

y = 22


So the solution is (3,22)

If you need more help, email me at jim_thompson5910@hotmail.com

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Jim