A.8 Direct & Inverse Variation
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Graph of a Direct Variation
A line that goes through the origin
Graph of an Inverse Variation
Two curves that never cross the x-axis or y-axis
How to check if a table represents an Inverse Variation:
check if xy is constant for each pair
How to check if a table represents a Direct Variation:
check if y/x is constant for each pair
Inverse Variation Constant (k)
k=xy
Direct Variation Constant (k)
k=y/x
In an Inverse Variation, as one variable increases...
the other variable decreases
In a Direct Variation, as one variable increases...
the other variable increases
Inverse Variation equation
y=k/x
Direct Variation equation
y=kx
