Question

If `[(x + y, 3y), (3x, x + 3)] = [(9, 4x + y), (x + 6, y)]`, then (x − y) = ?

पर्याय

• −7

• −3

• 3

• 7

Answer 1

−3

Explanation:

`[(x + y, 3y), (3x, x + 3)] = [(9, 4x + y), (x + 6, y)]`

Compare both sides

3x = x + 6

2x = 6

∴ x = 3

∴ x + 3 = y

3 + 3 = y    ...(x = 3)

∴ y = 6

Now, x − y = 3 − 6

= −3