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Let s represent speed.
To graph it, draw a number line. Show zero, 20, 50 and arrowheads at both ends. Draw closed circles at 20 and 50 and shade in between.
The perpendicular slope would be the negative reciprocal of -3, which is .
Let's see what the y-intercept should be, by finding one third of -6 and seeing how much we need to add or subtract to reach -9.
1/3 times -9 is -3.
To reach -6, we need to subtract 3.
So, the y-intercept is 7.
The equation is: .