Question

x - 2y = - 7
2x + 2y = 1

2x - y = 4
3x + 2y = 6

3x - y =0
-4x + y = -2

por favor e pra agora eu agradeço muito se me ajudar
​

Answer 1

Resposta:

$x - 2y = - 7 \\ 2x + 2y = 1 \\ \\ x - 2y = - 7 \\ x = 2y - 7 \\2(2y - 7) + 2y = 1 \\ 4y - 14 + 2y = 1 \\ 6y - 14 = 1 \\ 6y = 15 \\ y = \frac{5}{2} \\ \\ x = 2x( \frac{5}{2} ) - 7 \\ x = 5 - 7 \\ x = - 2 \\ \\ x = - 2 \\ y = \frac{5}{2}$

$2x - y = 4 \\ 3x + 2y = 6 \\ \\ 2x - y = 4 \\ 2x = y + 4 \\ x = \frac{1}{2} (y + 4) \\ x = \frac{1}{2} y + 2 \\ 3( \frac{1}{2} y + 2) + 2y = 6 \\ \frac{3}{2} y + 6 + 2y = 6 \\ \frac{7}{2} y + 6 = 6 \\ \frac{7}{2} y = 0 \\ \\ x = 2 \\ y = 0$

$3x - y = 0 \\ - 4x + y = - 2 \\ \\3x - y = 0 \\ 3x = y \\ x = \frac{1}{3} y \\ - 4x( \frac{1}{3} )y + y = - 2 \\ - \frac{4}{3} y + y = - 2 \\ - \frac{1}{3} y = - 2 \\ y = 6 \\ x = \frac{1}{3} \times 6 \\ x = 2 \\ \\ y = 6 \\ x = 2$

confia