Answer:
Direct variation; k = -3; y = -3x
Step-by-step explanation:
The formula for direct variation is
y = kx Divide both sides by x
k = y/x
<em>For x = -6, y = 2</em>:
k = -6/2
k = -3
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<em>For x = -9, y = 3</em>:
k = -9/3
k = -3
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<em>For x = -15, y = 5:
</em>
k = -15/5
k = -3
y = -3x
y and x are always in the same ratio, so y varies directly with x.