Given x = 3 and y = 15 - 2x, what is the value of xy?

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Multiple Choice

Given x = 3 and y = 15 - 2x, what is the value of xy?

Explanation:
Substitution into an expression to get a numeric value. With x = 3, compute y first: y = 15 − 2x = 15 − 2(3) = 9. Then multiply x and y: xy = 3 × 9 = 27. The other results would require y to have values that don’t occur when x = 3 (for example, 18 would need y = 6, 45 would need y = 15, and 0 would require a zero factor), so 27 is the correct product.

Substitution into an expression to get a numeric value. With x = 3, compute y first: y = 15 − 2x = 15 − 2(3) = 9. Then multiply x and y: xy = 3 × 9 = 27. The other results would require y to have values that don’t occur when x = 3 (for example, 18 would need y = 6, 45 would need y = 15, and 0 would require a zero factor), so 27 is the correct product.

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