Question

resolva o sistema abaixo
- × - y = 10
10 × + 5y = 150 ​

Answer 1

-x-y=10 (.5)

10×+5y=150

-5x-5y=50

10x+5y=150

5x=200

x=40

10x+5y=150

10.40+5y=150

5y=150-400

5y=-250

y=-50

-x-y=10

-40-(-50)=10

-40+50=10

×=40

y=-50