Q.

The equations

ax – (a + b) y = 1

and

(a – b) x + ay = 5

have a unique solution ….

A. … for all value of a and b

B. … only when \(a = b\)

C. … only when \({a}^{2} : {b}^{2} \neq 1 : 2\)

D. … only when a = 0 and b = 0

E.  … only when \(a \neq b\)

C. Only when \({a}^{2} : {b}^{2} \neq 1 : 2\)

\(\frac{a}{a-b} \neq -\frac{a+b}{a}\)

\({a}^{2} \neq [{a}^{2} – {b}^{2}]\)

\(2{a}^{2} \neq {b}^{2}\)

\(\frac{{a}^{2}}{{b}^{2}} \neq \frac{1}{2}\)