Question

{x+y=4
x-y =14
Rezolvati prin metoda reducerii sistemele. Ma puteti ajuta sunt CLS a -8-a

Answer 1

$\left\{\begin{matrix} x + y = 4\\ x - y = 14\end{matrix}\right.$

$x + x + y - y = 4 + 14$

$2x = 18 \: | \div 2$

$x = 9$

$x + y = 4$

$9 + y = 4$

$y = 4 - 9$

$y = - 5$

Answer 2

rezulta 2x=18,x =18:2,x=9
y=4 minus 4,y=4 mins 9,y=minus 5