Question

rezolvati ptin metoda substituties sistemele 2×+y=0 x-3y=7​

Answer 1

$2x + y = 0 \\ x - 3y = 7 \\ y = - 2x \\ \times - 3 \times - 2 = 7 \\ x + 6 = 7 \\ x = 1 \\ 2 \times 1 + y = 0 \\ 2 + y = 0 \\ y = - 2$