Question

Suppose y varies directly with x. Write a direct variation equation that relates x and y.

Answer 1

If y varies directly with x:

y = k * x

When x = 2, y = - 10.

- 10 = k * 2

k = - 10 : 2

k = - 5

Therefore: y = - 5 x

And when x = 12 ;

y = - 5 * 12

Answer:

y = - 60

Answer 2

y=kx y=-5x

-10/2=k 2/2 y=-5(12)

-5=k y=-60