Question

And this one please.

Answer 1

x = (3 + 8y) / (y - 1)

Explanation:

y = (x + 3) / (x - 8)

Make x the subject

y = (x + 3) / (x - 8)

Cross product

y * (x - 8) = (x + 3)

xy - 8y = x + 3

xy - x = 3 + 8y

Factorize the left hand side of the equation

x( y - 1) = 3 + 8y

Divide both sides by (y - 1)

x = (3 + 8y) / (y - 1)