Question

if y is directly propostional to x and y =24 when x =10 then find (a) The constant of proportinality (b) the value of y when x=24 (c) the value of x when y = 90

Answer 1

y=kx.

k is a constant

k=y/x

=24/10=2.4

or 24/10=12/5

y=kx

when x=24

y=12/5*24

=288/5

=57.6

when y=90

x=y/k

=90/2.4

=37.5