Assume that y varies directly with x, then solve. if y=-18 when x=6, find x when y=6.

The answer to your question is x = - 2

Step-by-step explanation:

This is a problem of direct proportions so,

                               y                           x

                            - 18        ⇒              6

                              6         ⇒               ?

We do cross multiplication

                              x =

Simplification

                             x =

Result

                             x = -2                    

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10