Question

If y varies directly with x, Write an equation relating x and y when y = -30 and x = 6.

6x = -30y

y = 5x

y = -5x

-6x = -30y

Answer 1

C.) Y = -5x

Explanation:

5 x 6 = 30

So...

if x = 6 and y = -30

-30 would have to equal -30

-5 x 6 = -30

So...

Y = -5x is the correct option

Answer 2

`y=-5x`

Explanation:

we know that

A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form
`y/x=k` or
`y=kx`

so

For
`x=6,y=-30`

substitute

`y/x=k`------>
`k=-30/6=-5`

therefore

`y=-5x`