Question

2x+y=1

X+Y=8
X-y=2

2X+y=9
X-2y=2

2X-y=11
X+2y=3

Answer 1

Resposta:

2×=10

×=10/2

×=5

×+y=8

5+y=8

y=8-5

y=3

S:(5,3)

×=2+2y

2.(2+2y)+y=9

4+4y+y=9

4y+y=9-4

5y=5

y=5/5

y=1

×=2+2y

×=2+2.1

×=2+2

×=4

S:(1,4)

×=3-2y

2.(3-2y)-y=11

6-4y-y=11

-4y-y=11-6

-5y=5(-1)

5y=-5

y=-5/5

y=-1

×=3-2y

×=3-2.(-1)

×=3+2

×=5

S:(-1,5)