Need asap system of equation of substituitons

You are given an expression for y, so put that expression where y is in the first equation.

... 12x -5(x+4) = -20 . . . . . x+4 substituted for y

... 12x -5x -20 = -20 . . . . eliminate parentheses

... 7x = 0 . . . . . . . . . . . . . . collect terms, add 20

... x = 0 . . . . . . . . . . . . . . divide by 7

... y = x +4 = 0 +4 = 4 . . . put the value of x into the expression for y

The solution is x=0, y=4.