Answer:
option #4 (-oo, +oo)
Step-by-step explanation:
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Solve by substitution


Just plug in y=-x-1 into y+x=3
So we get:

Simplify that:

And since that is not true, that means this system of equations has no solutions!
I’m pretty sure the 2nd one is the associate property and the 3rd one is the additive inverse property
Hope this helps :)
Yess!! That’s how u do it && continue to work hard!