Parallel lines have the same slope, so the slope of the line you want is -3/4. The point-slope form of the equation of a line is useful when you have this information:
y -k = m(x -h) . . . . . . line with slope m through point (h, k)
y -(-2) = -3/4(x -4)
If you want slope-intercept form, you can rearrange this ...
y +2 = -3/4x +3
y = -3/4x +1 . . . . . . subtract 2 from both sides
