Question

x +y=-7 x+3y=-9
x=?
y=? metoda substituției​

Answer 1

x+y = -7

x+3y = -9

x = -7-y

-7-y +3y = -9

x = -7-y

2y= -2

x = -7-y

y = -1

x = -6

y = -1