Question

The quanity y varies directly as the quanity x. when x=18, y=45

Answer 1

y = 2.5x

Explanation:

assuming you require the equation connecting x and y

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

y = kx ← k is the constant of variation

to find k substitute x = 18, y = 45 into the equation

45 = 18k ( divide both sides by 18 )

`(45)/(18)` = k , that is

k = 2.5

y = 2.5x ← equation of variation