A fortune teller asks you to choose one card X out of five (consider the cards as numbered from 1 to 5) without showing it to him. He then asks you to pick a number from the subset no larger than X and tell him. Indicating this second number as Y, find the joint pmf of X and Y

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!