SOLUTION: How do I solve these equations with the substitution method?? I tried to solve it but I'm not sure where I went wrong. 2x-y=2 x-2y=18.5 x+2y=18.5 -2y. -2y X= 18.5-2

Algebra ->  Expressions-with-variables -> SOLUTION: How do I solve these equations with the substitution method?? I tried to solve it but I'm not sure where I went wrong. 2x-y=2 x-2y=18.5 x+2y=18.5 -2y. -2y X= 18.5-2      Log On


   

Question 821843: How do I solve these equations with the substitution method?? I tried to solve it but I'm not sure where I went wrong.
2x-y=2
x-2y=18.5
x+2y=18.5
-2y. -2y
X= 18.5-2y

2(18.5-2y) -y=2
37-4y-y=2
37-5y=2
-37. -37
-5y=-35
-5y/-5. -35/-5
Y=7

X=18.5-2(7)
X=18.5-14
X=14.5

(14.5,7)

I ride rechecking my work but the answers weren't right
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

2x-y = 2

x-2y=18.5   | x = 18.5 + 2y

2(18.5+2y) - y = 2    |You had x  = 18.8 - 2y

  3y = -35

   y = -35/3  and x = -29/6   (18.5 -70/3 = 111/6 - 140/6 = -29/6 )

CHECKING our answer***

 Using 2x - y = 2

   2%28-29%2F6%29+-+%28-35%2F3%29+=+6%2F3+=+2