Which line on the graph below has an undefined slope?

On a coordinate plane, line Q is horizontal, line P has a positive slope, line R is vertical, and line S has a negative slope.
P
Q
R
S

1 answer

The line with an undefined slope is line R, which is vertical. In a vertical line, the change in x is zero, leading to division by zero when calculating the slope, which is why it is considered undefined.

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