The standard form of a line:
[tex]Ax+By=C[/tex]
The slope-point formula:
[tex]y-y_1=m(x-x_1)[/tex]
We have (-2, 0) and m = 4.
Substitute:
[tex]y-0=4(x-(-2))\\\\y=4(x+2)\\\\y=(4)(x)+(4)(2)\\\\y=4x+8\qquad|-4x\\\\-4x+y=8\qquad|\cdot(-1)\\\\4x-y=-8[/tex]
