Question

Resolva o sistema linear 3x - 4y=-5 x + 2y = 5​

Answer 1

{3x - 4y = -5

{x + 2y = 5

x + 2y = 5 . 2

2x + 4y = 10

3x - 4y = -5

+

2x + 4y = 10

5x + 0 = 5

5x = 5

x = 5/5

x = 1

x + 2y = 5

1 + 2y = 5

2y = 5 - 1

2y = 4

y = 4/2

y = 2