Question

If x/y = 3/z then 9y^2 equals

Answer 1

x/y= 3/z
cross multiplying
3y= xz
squaring both sides
9y square = x^2 × z^2

Answer 2

x/y =3/z
x*z/3 = y
so
y = zx/3 ......put this in 9y²
9*(zx/3)²
9*z²x²/9....cut 9 with 9.....
z²x² is req answer