What value of x make the equation - 4+ 1/2 x=8 true?

-4 +  1/2 x = 8

-4 + 1/2 (24) = 8

i think it would be 42cm

y = 3x+4

step-by-step explanation:

to find the slope

slope = (y2-y1)/ (x2-x1)

    = (-8-4)/ (-4-0)

    = -12/-4

  = 3

using the slope intercept form of a line

y= mx+b

we know the slope is 3

we know the y intercept is 4 ( the point where it crosses the y axis or x=0)

y = 3x+4