y=mx+b
m=slope
b=y-intercept or y value when x=0
we are given slope=4 and a point (1,2)
we can use the slope=4, as m=4, but we don't know y intercept
replace it with b and solve for the value of b that will make the equation true when the point (1,2) is put into it
(1,2), x=1 and y=2
y=4x+b
2=4(1)+b
2=4+b
-2=b
the equation is y=4x-2
answer is H