3 people working on the same task it takes A to complete task in 150 minutes and B to complete task in 145 minutes and C to complete task in 180 minutes how do I figure rate of work calculations

Abit confused about what you mean, but i think you might be referring to slope intercept form: y = mx + bin that case b, or the y intercept is already given.(0,-1)find the slope by using the formulay2 - y1/x2 - x1the final slope will be 4/2, equivalent to 2.now your equation should look like thisy = 4/2x -1sorry if this didn’t you out!