Determine which of the lines, if any, are parallel or perpendicular. Explain. 9. The lines pass through the following points:
Line a: (1, 5) and (-2, -4)
Line b: (3, 2) and (1, -4)
Line c: (6, 1) and (-4, 2)

10.
Line a: 4y - 12x = 20
Line b: 3y = -x + 2
Line c: y = 3x - 1

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