y = x/k so k = 1/25; when x = 1, x/k, hence y, = 25
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40
y = -5
Find an equation of variation where y varies directly as x. One pair of values is y = 80 when x = 40
y = 8
Since r varies directly with s, we have r = ks (replace k with 5 and s with 7) r = (5)(7) r = 35