Solve equations X+2y=12 and 3x-3y=4 with subsitution and elimination.

Question

So for example like

if x+2y=12 end up being at the end x=3.5

you would put it into the next equation like 3(3.5)-3y=4

and etc for substitution and elimination

Answer 1

substitution Method:

From x + 2y = 12, we get x = 12 - 2y, and take it to equation 3x - 3y = 4, we have 3(12 - 2y) - 3y = 4, which is 36 - 6y - 3y = 4, or 36 - 9y = 4, we get y = 32/9, and x = 44/9