Justin W. answered • 09/22/15

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Math, Science, Philosophy, and All Forms of Knowledge.

Hello Laurie,

The general form of a linear equation is (y - y0) = m * (x - x0). This produces the slope equation m = (y1 - y0)/(x1-x0).

For your problem, x0 = $55, y0 = 1000, x1 = $85, y1 = 600.

m = (600 - 1000)/(85 - 55) = -13.33 units/$

Now, plugging this slope in the general form, we have:

(y - y0) = -13.33*(x-x0)

Choose either point, (x0,y0) or (x1,y1), and plug into this general form.

(y - 1000) = -13.33*(x-55)

y = -13.33*x +1733.15

I believe this will give you a strong start on this problem.