Question

Metoda reducerii
(
2x - 3y = -7

x+4yegal 2​

Answer 1

2x - 3y = -7

x + 4y = 2 ⇒ x = 2 - 4y

2 × (2 - 4y) - 3y = -7

4 - 8y - 3y = -7

4 - 11y = -7

11y = 4 - (-7)

11y = 4 + 7

11y = 11

y = 11 : 11

y = 1

x = 2 - 4 × 1

x = 2 - 4

x = -2

S = {(-2, 1)}