Use the substitution method to solve the system of equations.
x+y=11
-x=-y-9

Like you said, we need to use substitution to solve for y.

Now that we've solved for y, we can plug in the number we got into one of the original equations. (You can choose either equation, but I will use the first one.)

Now we have the solution of this system.

in the attachment.   i didn't see your choices.   the word which means there is choices.

step-by-step explanation:

(x,y)

x tells you how much left or right you go from the origin

y tells you how much down or up you go from the origin

so for example (-3,2), you go left 3 and up twice. i denoted which of the ordered pairs is which in my graph.

3+x

step-by-step explanation: