find the slope of the line passing through the points (a, -a+2) and (a+h, -(a+7h)+2)
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The slope of a line is given by (difference in y)/(difference in x)
difference in y = -(a+7h)+2 - (-a+2)= -a -7h +2+a-2 = -7h
difference in x = a+h - a = h
The ratio is -7h/h = -7
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