If 5 men can do a piece of work in 20 days, in how many days could 10 men
do the same work?

Im pretty sure its 10 days

Where m is the slope of the line and b is the y-intercept of the line, or the y-coordinate of the point at which the line crosses the y-axis. to write an equation in slope-intercept form, given a graph of that equation, pick two points on the line and use them to find the slope. this is the value of m in the equation.