SOLUTION: Which equations is undefined A) y=4 B) y=-2x C) x=4 D) y=x+4

Question 42674: Which equations is undefined
A) y=4
B) y=-2x
C) x=4
D) y=x+4
Found 2 solutions by Nate, rapaljer:
Answer by Nate(3500) (Show Source): You can put this solution on YOUR website!
Vertical lines are undefined:

take two points: (4,0) and (4,2)
M = (y2 - y1)/(x2 - x1) = (0 - 2)/(4 - 4) = -2/0 undefined
(C) is your answer.
Answer by rapaljer(4671) (Show Source): You can put this solution on YOUR website!
Do you mean which equation has a SLOPE that is undefined? If so, then this would be the vertical line, which is C) x= 4.

R^2 at SCC
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