Question

Resolva o sistema

X+y=10
2×-y=2

X-y=3
-2×+2y=-6


2x-y=1
4×-2y=4

Answer 1

x+y=10 (-2)
2x-y=2

-2x - 2y = -20
>2x - y = 2
__________
>>>>-3y=-18
>>>>> y= -18/-3
>>>>> y=6

x+y=10
x+6=10
x=10-6
x=4

x-y=3 (2)
-2x+2y=-6

2x - 2y = 6
-2x + 2y =-6
__________
x=0
y=0

2x-y=1 (-12)
4x-2y=4 (6)
-
-24x + 12y = 12
>24x - 12y=24
___________
x=0
y=0