Question

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Answer 1

slope of a line comes from (y2-y1)/(x2-1)
so substitute
(-2-7)/(-2+2)
-9/0
so the slope is undefined since you can divide by zero and an undefined equations are x=?
in this case x=-2

Answer 2

a parallel line would have to be another x=? which is only 3x=5 which becomes x=5/3

Answer 3

the line you picked would have been perpendicular

Answer 4

yes

Answer 5

isnt that the same-side interior angles theorem?