4. Solve each equation for x. a. 3x - 12y = 27
c. 4x - k= 17
b. 6x - 7y= -2
d. kx + c = 9

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