Question

Resolva o sistema 2X+3Y=5 -4X-9Y=-19

Answer 1

2x + 3y = 5      *(3)
-4x - 9y = -19

6x + 9y = 15
-4x - 9y = -19

2x = -4
x = -4/2
x = -2

6x + 9y = 15
6*(-2) +9y = 15
-12 + 9y = 15
9y = 15 + 12
9y = 27
y = 27/9
y = 3

Resposta: O x vale -2, e y vale 3.