Answer:
Line 1: zero
Line 2: positive
Line 3: zero
Line 4: negative
Step-by-step explanation:
Line 1:
Slope is calculated by rise/run. Since it's a horizontal line, it would be 0/1 which is 0.
Line 2:
The line is going upwards, so the slope is positive.
Line 3:
Same as line 1
Line 4:
The line is going downwards, so the slope is negative.
