$\"\"$

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Using a proportion that relates the values.

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$\"\"$ (Direct proportion)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Apply Cross multiplication)

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$\"\"$

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$\"\"$

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$\"\"$ (Divide each side by negative 15)

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$\"\"$

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Therefore, $\"\"$ the value of y is $\"\"$ $\"\"$

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The value of y is $\"\"$ .