What's the answer for is substitution

Y=-2

4x-3y=18

First you plug the y into the equation you are substituting it into, this gives you

4x-3 (-2) = 18

multiply the - 3 by the - 2 to get 4x+6=18

Subtract the 6 from both sides to get 4x=12

Finally divide by 4 to get x=3