Question

10. Suppose that y varies directly with x. When y is 12, x is -3. What is y when x is 4?

PLEASE HELP

Answer 1

y = -16

Explanation:

Given that,

y varies directly with x. Mathematically, we can write it as follows :

`y\propto x`

or

`y=kx`

Where

k is constant

Put y = 12 and x = -3 to find k. So,

`k=(y)/(x)\\\\k=(12)/(-3)\\\\k=-4`

Now put k = -4 and x = 4. So,

`y=-4* 4\\\\=-16`

So, the required value of y is equal to -16.