Math Expression: Positive and Negative Slope Question

The following coordinate plane has 5 lines. Each line has 'positive' or 'infinite'.

How many lines are labeled correctly?

Step 1

Looking at the reference picture below, the line on the right has a positive slope.

Therefore, the slope for this line is correctly labeled.
Step 2

Looking at the reference picture below, the line on the right has a negative slope.

Therefore, the slope for this line is correctly labeled.
Step 3

Next, looking at the reference picture below, the line on the right has zero slope.

Therefore, the slope for this line is should be zero and not infinite.
Step 4

Looking at the reference picture below, the line on the right has infinite slope.

Therefore, the slope for this line is should be infinite and not zero.
Step 5

Finally, looking at the reference picture below, the line on the right has negative slope.

Therefore, the slope for this line is should be negative and not positive.
Step 6

Of all the 5 lines, only 2 are correctly labeled. Hence, the answer is B.