Question

rezolvati in multimea R sistemul de ecuatii
2x+y=4
x-y=-1​

Answer 1

$y = 4 - 2x \\ x - y = - 1 \\ \\ x - (4 - 2x) = 1 \\ x = 1 \\ \\ y = 4 - 2 \times 1 \\ y = 2$