Parallel and perpendicular lines
question: find the slope of a line perpendicular to 3x + 5y = 15
answers: a. -5/3 b. -3/5 c. 3/5 d. 5/3
if someone could me with this subject i would greatly appreciate it!

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