The price of an mp3 player was on sale for 20% off. matt bought the mp3 player and it had a rebate of $50. how much did matt pay for the mp3 player?

To do this problem first you would have to charge 20% into 0.20 after you do that you would do 0.20 x 50.00 and you would get 10 so 10 is how much you take off of 50 so then you do 10-50=40 so your answer would be that Matt would have to pay $40 for the MP3 player  

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!

The equation i believe is 4+ i am not sure about the part: the number of weeks in a group of days so i can't you on that part