Eric H. answered • 02/22/21
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Lexy A.
asked • 02/22/21The points (1,r) and (6,-8) lie on a line with slope -3. Find the missing coordinate r.
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slope = -3 = change in y coordinates divided by change in x coordinates = (-8-r)/(6-1)= -(r+8)/5
15 = r+8
r = 7
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