I think you forgot to put more information at the beginning.
Answer:
x - 3 = 21 - 2
Step-by-step explanation:
x - 3 = 21 - 2
Add 3 to each side.
x = 21 + 1
x = 22
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Graph 1 and 3 have the same domain
Y=mx+b
m=slope
b=yintercept
given
y=-2x+3 and
y=-4x-1
first equation is slope -2 and yintercept 3
second is slope -4 and yintercept -1
3rd option