Question

Find an equation of variation where y varies directly as x and y = 2 when x = 10, find y when x = -25.

Answer 1

y = ⅕x; -5

Explanation:

y = kx

k = y/x Divided both sides by x

k = 2/10

k = ⅕

y = ⅕x

The equation of variation is y = ⅕x.

If x = -25,

y = ⅕(-25) = -5