Question

-2+y=9 3x-7y=3 solve the system by the substitution

Answer 1

Hello from MrBillDoesMath!

Answer:

x = 80/3 ( 26 2/3)

y = 11

Discussion:

Step 1:

-2 + y = 9  =>                         add 2 to both sides

2 +  -2 + y = 9  +2 =>

y = 11

Step 2:

Substitute y = 11 (from Step 1) into

3x - 7y = 3  =>

3x - 7(11) = 3 =>               y = 11 from Step 1

3x - 77 = 3 =>                   add 77 to both sides

3x - 77 + 77 = 3 + 77 =>

3x = 80 =>

x = 80/3

Thank you,

MrB