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EQUATION:
[tex]y = kx[/tex]
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First, find the constant of variation using the formula [tex]k = \frac{y}{x}[/tex] , since y varies directly as x.
[tex]12 = 4k[/tex]
[tex]k = \frac{12}{4}[/tex]
[tex]k = 3[/tex]
Therefore the constant of variation is 3.
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Then, find y when x is equal to twelve, using the equation of variation [tex]y = 3x[/tex] .
[tex]y = 3x[/tex]
[tex]y = (3)(12)[/tex]
[tex]y = 36[/tex]
Learn more about direct variation:
The statements:
may be translated mathematically as [tex]y=kx[/tex] where k is the constant of variation.
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