If xx and y vary directly and y is 21 when x is 7, find y when x is 5

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Camiloqp asked Dec 17, 2023

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If xx and y vary directly and y is 21 when x is 7, find y when x is 5

Mathematics
middle-school

Camiloqp asked Dec 17, 2023

by Camiloqp

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7 votes

Answer:

y = 15

Explanation:

We need to solve for k

y = x

21 = 7k Divide both sides by 7 to solve for k

3 = k

y = xk

y = 5(3)

y = 15

David Rees answered Dec 18, 2023

by David Rees

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30 votes

Answer: y = 15

Step-by-step explanation:

Despotbg answered Dec 22, 2023

by Despotbg

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