Question

1. If x and y vary inversely from each other and:
a) X=3 when y=8, find y when x=4.
b) X=5 when y=15, find x when y=12.
c) X=30, find y when constant of variation= 900.

Answer 1

Y = k/x

a) 8 = k/ 3

K = 24

y = 24/4

y = 6

b)15 = k/5

k = 75

12 = 75/x

x = 6.25

c) y = 900/30

y = 30