Let x and y be directly related such that y=9 when x=3. Find y when x=7

Answer 1

Greetings! Lets solve this shall we ?

So, we shall find what y equals when x is 7 such that

y = kx (varies directly), where 9 = 3k initially. Then, k = 3. Now,

y = (3)(7)

y = 21

I hope this helped!