Direct Variation 3.6. Direct Variation Direct Variation is when two variables can be expressed as...
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Transcript of Direct Variation 3.6. Direct Variation Direct Variation is when two variables can be expressed as...
Direct Variation3.6
Direct Variation
Direct Variation is when two variables can be expressed as y=kx where k is a constant and k is not 0.
k is called the constant of variation
Ex. y = 5x is direct variation while y = x + 5 is not
Example 1
Does the equation represent a direct variation? 2x – 3y = 0
-x + y = 4
Example 2
Graph a direct variation equation Y=2/3 x
y = -3x
Write a direct variation Equation
Start with y = kx Substitute a known x and y Solve for k
Example 3
Write the equation for the
direct variation represented
in the graph.
Homework
p. 194-195: 3-9 all, 11-21 odd (graph paper and rulers needed), 23-25 all