প্রশ্ন: x + 2y = 7, 2x = 3y হলে (x, y) এর মান কত?

সমাধান:
x + 2y = 7..............(1)
2x = 3y
2x - 3y = 0 ................(2)

(1) × 2 - (2) ⇒
2x + 4y - 2x + 3y = 14
7y = 14
y = 2

(1) ⇒
x + 2y = 7
x + 2 × 2 = 7
x + 4 = 7
x = 7 - 4
x = 3

(x, y) = (3, 2)