Question

Please help me with this problem

Answer 1

y = - 2x

Explanation:

Given that x and y vary directly then the equation relating them is

y = kx ← k is the constant of variation

To find k use the condition x = - 5, y = 10, thus

k =
`(y)/(x)` =
`(10)/(-5)` = - 2, hence

y = - 2x ← is the equation relating them