.A chemical decays in such a way that the amount left at the end of the week is 30% less than the amount at the beginning of that same week. What percentage of the original amount is left after two weeks

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!

D. m < 13 (hope this )