Consider the following three equations:

MATHEMATICS · Subjective · CBSE · Mathematics · Pair of Linear Equations in Two Variables · Pair of Linear Equations in Two Variables

Problem

Consider the following three equations: (I)

2x + 3y = 7

(II)

3x - 3y = 9

(III)

5x + 6y = 8

Which pair of equations will allow

y

to be eliminated by directly adding or subtracting the two equations without any scaling? State only the pair number(s).