Oh, dude, the product of 4A and b is simply 4Ab. It's like when you mix 4 of something with another thing called b, you get 4Ab. It's not rocket science, just some good ol' multiplication.
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4a² - b² = (2a + b)(2a - b)
5ab-2ab+4a-b+5b = 3ab+4a+4b
(ab/b) / (4a/5b) =(ab / b) * (5b / 4a) = (5ab2 / 4ab)= 5 / (4b)
They appear to be the equations of two parallel lines in the a-b plane.
The expression is: (4a+b)/(2a-5b)