k = x y
x = k/y
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xy = K so K = 21
xy = 8 or y = 8/x
y = x/k so k = 1/25; when x = 1, x/k, hence y, = 25
The equation is xy = k where k is the constant of variation. It can also be expressed y = k over x where k is the constant of variation.
xy + z = 9Subtract 'z' from each side:xy = 9 - zDivide each side by 'x':y = (9 - z) / x