Question

help me plz (problem in comments)

Answer 1

try to find two points on the trend line that are easy to read. For example, (0,110) and (10,90) are two points that are right on the tick marks so it's easy to determine these two points.

Let one of the points be (x1,y1) and the other one be (x2,y2) and calculate the slope. m = (y2-y1)/(x2-x1).

for the y-intercept, you can see on the graph that it crosses the y-axis at (0,110) so your y-intercept (b-value) is simply 110.

from there, once you have your m and b values, you can write your equation in y = mx + b. finally, since they're using N and M as the independent/dependent variables instead of x and y, you'd treat N as equivalent to y and M as equivalent to x. (your m-value goes into the first blank before M, and the b-value goes into the second blank)