Download Direct Variation

Direct Variation:
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A function in the form y = kx, where k is the constant of variation
You can say that y varies directly as x
A direct variation must also pass through the origin ie) if x=0 then y=0
y
y y
y
k  1 and k  2 1  2
x1
x2 x1 x2
k is also called the constant of proportionality, and y is said to be directly
proportional to x
y1 y2
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x1 x2
Inverse Variation:
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Is a function defined by an equation of the
k
,where x  0
x
You can say that y varies inversely as x or that y is inversely proportional to x
k is the constant of variation
x1 y1  x2 y2
form: xy  k , where k is a non-zero constant or y=
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