Solve the following system of equations by elimination method:

 (CBSE 2005)

Given pair of linear equations is

…(i)

And …(ii)

On multiplying Eq. (ii) by 3 to make the coefficients of equal, we get the equation as

…(iii)

On subtracting Eq. (i) from Eq. (iii), we get

⇒ y = b

On putting y = b in Eq. (ii), we get

⇒ x = – a

Hence, x = – a and y = b , which is the required solution.