Explain what m and b in the equation y=mx b tell you about the graph of the line with that equation

So,

y = mx + b is the slope-intercept form.

"m" represents the slope.  It will allow you to find additional points on the specified line by determining the "rise" and the "run."  The "rise" means vertical movement, and the "run" means horizontal movement.

"b" represents the y-intercept, which is the point on the line where x = 0.  When x = 0, the line crosses, or intercepts, the y-axis.