SOLUTION: Could someone please show me how to solve by substitution method? 8x - 2y = -70 3x + 26 = y

Algebra ->  Graphs -> SOLUTION: Could someone please show me how to solve by substitution method? 8x - 2y = -70 3x + 26 = y      Log On


   

Question 435727: Could someone please show me how to solve by substitution method?
8x - 2y = -70
3x + 26 = y
Found 2 solutions by ewatrrr, rwm:
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

  y = 3x+26

 8x - 2y = -70

 8x-2(3x+26) = -70     |substituting for y

 8x - 6x - 52 = -70

      2x = -18

       x = -9  and y = -1   (-27+26)



CHECKING our Answer***

  8x - 2y = -70

  -72 + 2 = -70

Answer by rwm(914) About Me  (Show Source):
You can put this solution on YOUR website!
plug in 3x+26 for y in the first equation
8x-2*(3x+26)=-70
now solve for x
8x-6x-52=-70
2x=-18
x=-9
now plug 9 in for x in either equation
3*(-9)+26=y
-27+26=y
-1=y