3y - 12x = 18

2y-8x = 12

x=0

y=6

Step-by-step explanation:

3y - 12x = 18

2y-8x = 12

rearrange the equation

2y-8x=12

add 8x to both sides

2y=8x+12

divide both sides by 2

y=4x+6

now substitute it into 3y-12x=18

3 (4x+6) - 12x=18

simplify

12x+18-12x=18

simplify

18=18

x=0

substitute to find y

2y-8 (0) = 12

2y=12

y=6

Recheck:

3 (6) - 12 (0) = 18

18=18

2 (6) - 8 (0) = 12

12=12

the answers would be - 4 for the first and for the second it would be 15