LC HL Maths 2016 paper 1 q2

Modular equations. Simultaneous equations - one linear and one quadratic. Leaving certificate Maths

[@user-pr4vg4dh7e]

how is the lowest common denominator 4 when there is a 2

[@donegalmathsgrinds]

In order to add fractions the denominator must be the same ,imagine adding 1/4 and 1/2.