Question

Solve: (x + y)dy = a² dx

Answer 1

I don't know I don't know

Answer 2

let solve the equation
flip the equation
a^2 dx = (x*d*y+y*y*d)
a^2 dx = dxy+dy^2
bring dx on the other side and divide
a^2 =dxy+dy^2÷dx
a^2=xy+y^2÷x
take square root on both side
$\sqrt{a ^{2} } = \sqrt{xy + y {}^{2} } \div x$
a=
$\sqrt{x y + y ^{2} } \div x$