Question

Solve the equation for a. K = 4a+9ab

Answer 1

So try to isolate a by division and such
K=4a+9ab
we use reverse dstributive which is ab+ac=a(b+c) so
undistribute a
4a+9ab=a(4+9b)
k=a(4+9b)
divide both sides by (4+9b)
$\frac{k}{4+9b}$=a
a=$\frac{k}{4+9b}$

Answer 2

K=9ab+4a
A=k/9b+4
B=-4/9 + k/9a