y = (1/2)x + 4 has a y-intercept of (0,4). (Just let x = 0 and find y.)
Let y=0 and solve for x to find the x-intercept:
0 = (1/2)x + 4, or x = -8. Then the x-intercept is (-8, 0).
Plot (0,4) and (-8,0), and then draw a line thru these 2 points.
Alternatively, plot a dark dot at (0,4). Since the slope is 1/2, move 2 spaces to the right from this dark dot, and then 1 space UP. Draw a line thru your two points.
