If y is proportional to x and y = 15 when x = 3, what is y when x = 9?

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Multiple Choice

If y is proportional to x and y = 15 when x = 3, what is y when x = 9?

Explanation:
Direct proportionality means y scales with x in a constant ratio, so y = kx. Using y = 15 when x = 3 gives k = 15/3 = 5. When x = 9, y = 5 × 9 = 45. So the value is 45.

Direct proportionality means y scales with x in a constant ratio, so y = kx. Using y = 15 when x = 3 gives k = 15/3 = 5. When x = 9, y = 5 × 9 = 45. So the value is 45.

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