Question

How do you find an equation of variation where y varies directly as x and y = 0.8 when x = 0.4?

Answer 1

`y=2x`

Explanation:

`y" "`varies as `x`

`=>y=kx`

for some constant `k`

`0.8=kxx0.4`

`k=0.8/0.4=2`

`:.y=2x`