I don't remember what is a extraneous solution, but i hope it helps
Answer:
x = 0 and y = 4
x = 4 and y = 0
thus: 2 solutions
Step-by-step explanation:
Not really understanding what you are asking
Answer:
9) y = -x + 5
10) y = -7/2x - 5
11) y = x - 1
12) y = -5x/3 - 3
13) y = -4x/1
I'm not 100% sure for some of these answers since the pic is a bit blurry, but they're pretty accurate.