The graph of which of the following will be parallel to the graph of 4x – 3y = –12?
a. y=4/3x - 3/2
b. 6x-4y=-8
c. y=3/4x +1
d. 4x – 2y = –12

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola is (0, –12). the y-intercept of the second parabola is (0, –24). what is the positive difference between the a values for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth