Question

If y varies directly with x and y = 15 when x = 3, find the equation that relates x and y

Answer 1

Answer:

y = 5x

Step-by-step explanation:

The equation for direct variation is y = kx, where k is the factor of variation. So we know that y and x must fit into this formula.

They've given us a y and x value to solve for k.

y = kx

15 = 3k

15/3 = k

k = 5

Plug k back into our equation.

y = 5x

Answer 2

Answer:

It should be 5x=y

Step-by-step explanation:

If you have x as being 3 and y as being 15, then you have to have 5 x's to get y because:

5x=y

5(3)=15

15=15

Hope it helped you