Question

If y varies directly with x and y=12 when x=3, find y when x=1.

Answer 1

y = 4

Explanation:

y ∝ x

y = kx (k is constant)

when y = 12 and x = 3

y = kx

=> 12 = k*3

∴ k = 4

when x = 1 and k = 4

y = kx

= 4*1

= 4