Question

ecuația: ×+y=1 ×-y=4​

Answer 1

Explicație pas cu pas:

$x + y = 1 \\ x - y = 4 \\ \\ 2x = 1 + 4 \\ 2x = 5 \\ x = \frac{5}{2}\\ \\ \frac{5}{2} + y = 1 \\ y = 1 - \frac{5}{2} = \frac{2 - 5}{2} \\ y = - \frac{3}{2}$

Answer 2

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