Question

line 3 positive negative zero undefined

Explanation:

Step1: Recall slope - definition

The slope of a line is given by $m=\frac{y_2 - y_1}{x_2 - x_1}$ for two points $(x_1,y_1)$ and $(x_2,y_2)$ on the line. If the line rises from left - to - right, the slope is positive.

Step2: Analyze the line

The line in the graph rises from left to right. As $x$ increases, $y$ also increases.

Answer:

Positive