If find the value of (x + y).
Given two matrices are equal.
We know that if two matrices are equal then the elements of each matrices are also equal.
∴2x + 1 = x + 3 …… (1)
⇒ 2x – x = 3 – 1
⇒ x = 2
And 5x = 10 …… (2)
y2 + 1 = 26…… (3)
⇒ y2 = 26 – 1
⇒ y2 = 25
⇒ y = 5 or – 5
∴ x = 2, y = 5 or – 5
∴ x + y = 2 + 5 = 7
Or x + y = 2 – 5 = – 3