Let y varies directly as x. If y = 15 when x = 3, then write a linear equation. What is the value of y when x = 5?

It is given that y is directly proportional to x. So,

Therefore taking a constant k to get,

.If y=15,when x=3 than the value of the constant is-

Therefore the linear equation is-

Hence the value of y when x=5 is-

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