Question

REZOLVATI prin metota reducerii sistemele
a ) - x+ y=7
x+3y=5

Answer 1

sper ca te-am ajutat

Answer 2

$\left \{ {{-x+y=7} \atop {x+3y=5}} \right.$

$-x+x+y+3y=7+5$

$4y= 12$

$y=\frac{12}{4}=3$

$-x+y=7$

$-x+3=7$
$-x=4$

$x=-4$