Question 425689
Find the value of r so the line that passes through each pair of points has the given slope.

(r,5), ( -2, r) ,m = -2/9   is a fraction 

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slope = (r-5)/(-2-r) = -2/9
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Cross-multiply:

9(r-5) = 2(2+r)
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9r-45 = 4+2r
7r = 49
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r = 7
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Cheers,
Stan H.
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