Question

If y varies derictly as ×and y is 15 when ×=3,find y if ×=5.

Answer 1

Answer:

The answer is 25

Step-by-step explanation:

Given y varies directly as x

      $\Rightarrow y=kx$, where k is proportionality constant

Given $y=15$, when $x=3$

    $\Rightarrow 15=k(3)\Rightarrow k=\dfrac{15}{3}=5$

Thus value of y when $x=5$ is

      $y=kx=(5)(5)=25$