Exploration of parent function y=x.
y=x is the parent function for the line.
Try changing the b value. What happens?
Try a negative b value also. What happens?
Now set the b value back to 0.
Try changing the m value. What happens?
Try a negative value for m also. What happens?
Set m back to 1.
Now, change both m and b at the same time. What happens?