Question

Please help me out!!!!!!!!

Answer 1

x = - 6

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 = - 9 when x = 3, thus

k =
`(y)/(x)` =
`(-9)/(3)` = - 3

y = - 3x ← equation of variation

When y = 18, then

18 = - 3x ( divide both sides by - 3 )

x = - 6