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

y = - 5x

Explanation:

given that y varies directly as x, then the equation relating them is

y = kx ← k is the constant of variation

To find k use the condition y = - 30 and x = 6

k =
`(y)/(x)` = ( - 30/ 6) = - 5

hence y = - 5x ← equation of variation