Make (frac{a}{x}) the subject of formula (frac{x + 1}{x – a}) = m

A.
(frac{m – 1}{m + 1}) 
B.
(frac{m + 1}{1 – m}) 
C.
(frac{m – 1}{1 + m}) 
D.
(frac{m + 1}{m – 1})
Correct Answer: Option A
Explanation
(frac{x + a}{x – a}) = m
x + a = mx – ma
a + ma = mx – x
a(m + 1) = x(m – 1)
(frac{a}{x}) = (frac{m – 1}{m + 1})