Question

Given that y varies directly with x, write the equation that relates x and y.

Answer 1

a)Given x=8, y=56.

$y=7x=7\times8=56$

Hence, the equation is y=7x.

b) Given x=1/3, y=15

$y=45x=45\times\frac{1}{3}=15$

Hence, the equation is y=45x.

c) x=4, y=18.

$y=4x+2=4\times4+2=18$

Hence, the equation is y=4x+2.