Question

If x = y = 3: 4, find (4x + 5y) = 5x - 2y

Answer 1

let x and y be 3z and 4z respectively.
(4x+5y)=4×3z+5×4z
=12z+20z
(4x+5y) =32z.
now,
5x-2y=5×3z-2×4z
=15z-8z
5x-2y=7z.
so their ratio=(4x+5y)/5x-2y
$= \frac{32z}{7z} \\ = \frac{32}{7}$
=32:7
I hope it helps you.