- 5a + 8b = 11, 6a - 4b = - 2 হলে a + b = কত?

প্রশ্ন: - 5a + 8b = 11, 6a - 4b = - 2 হলে a + b = কত?

সমাধান:
দেয়া আছে,
- 5a + 8b = 11................... (1)
6a - 4b = - 2 ...................(2)

(1) + (2) × 2 ⇒
- 5a + 8b + 12a - 8b = 11 - 4
7a = 7
a = 1

- 5a + 8b = 11
(- 5)(1) + 8b = 11
- 5 + 8b = 11
8b = 11 + 5
8b = 16
b = 16/8
b = 2

a + b = 1 + 2 = 3