Question

Y=x+1
y=-2x-11
substitution

Answer 1

y=x+1

y=-2x-11

-x+y=1

2x+y=1

per subssitution :

-x+y=1 we substitut y:

→y=1+x

we replace y in the other equation :

2x+y=1

→2x+1+x=1

→3x=1-1

→x=0

calcul y:

-x+y=1

-0+y=1

y=1

solution (0;1)

Explanation: