Question

metoda reduceri

x-y=5
y=3-x

metoda subtitutiei

4x-y=6
5x-2y=6

va rog!​

Answer 1

$a)$

$(x - y = 5 \\ (y = 3 - x$

$(x - y = 5 \\ (x + y = 3$

$2x = 8$

$x = 4$

$4 + y = 3$

$y = - 1$

$b)$

$(4x - y = 6 \\ (5x - 2y = 6$

$(y = - 6 + 4x \\ (5x - 2y = 6$

$5x - 2( - 6 + 4x) = 6$

$x = 2$

$y = - 6 + 4 \times 2$

$y = 2$