An innovative rural public health program is reducing infant mortality in a certain west african country. pretend the program in senegal has been reducing infant mortality at a rate 8.4 % per year. how long will it take for infant mortality to be reduced by 40 %?

Sorry for the delay but if you take 8.4 times 5 you get 42 so the answer is about 5 years but I'm not exactly sure. 

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!