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What is the slope of the line that contains the points (4,8) and (9,8)? what type of line is 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

Astudent showed the steps below while solving the inequality |x-4|< 1 by graphing.