SOLUTION: y=x and 3x +2y=20 solution:(4,4) how did my text book come up with the solutions (4,4)

Algebra ->  Systems-of-equations -> SOLUTION: y=x and 3x +2y=20 solution:(4,4) how did my text book come up with the solutions (4,4)      Log On


   

Question 186259: y=x and 3x +2y=20


solution:(4,4)


how did my text book come up with the solutions (4,4)
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
y=x
3x+2y=20
Replacex with y in the second equation & solve for y.
3y+2y=20
5y=20
y=4 ans.
4=x
x=4 ans.
Proof:
3*4+2*4=20
12=8=20
20=20