image
Step-by-step explanation
Step 1
When a line slopes up from left to right, it has a positive slope(red line)
When a line slopes down from left to right, it has a negative slope(purple line)
When there is no change in y as x changes, the graph of the line is horizontal. A horizontal line has a slope of zero.(blue line)
When the line is a vertical line, the slope is undefined(green line)
Step 2
identify every slope in the picture following step 1
line1:line slopes down from left to right,then it is a negative slope
line2:the line slopes up from left to right,then it is a positive slope
line3:the line is a vertical line,then it is a undefinded slope
line4:the lines is horizontal, then the slope is zero
I hope this helps you