Solve the system by substitution.

3x-7y=12

3x-12y=6

x=34/5 y=6/5

Step-by-step explanation:

so first you need to isolate one variable in one equation

so lets use 3x-12y=6

3x=12y+6

x=4y+2

then, as the name implies, we substitute it into the second equation

3 (4y+2) - 7y=12

then we simplify

12y+6-7y=12

5y=6

y=6/5

then we plug it in to find x

3x-7 (6/5) = 12

3x-42/5=12

3x=102/5

x=34/5

check work

3 (34/5) - 12 (6/5) = 6

102/5-72/5=6

30/5=6

6=6