Suppose y varies directly with x if y=27 when x=3 what is y when x=5

The value of y when x = 5 is 45

Given that y varies directly with x. This can be written mathematically as:

y  ∝  x

 ---- eqn 1

Where "k" is the constant of propotionality

Given y = 27 when x = 3. Substitute these values in eqn 1

Substitute k = 9 in eqn 1

y = 9x ----- eqn 2

To find: y = ? and x = 5

Substitute x = 5 in eqn 2

Thus the value of y when x = 5 is 45

ok

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