Question

how do i write a linear equation for this graph?

Answer 1

if you did this trendline on word or excel, you should be able to right click the graph and show the full equation for the trendline (I believe it's under format trendline ---> trendline options ---> display equation on chart)

if not, you can pick two points on your trendline (it looks like your trendline goes through points (0,100) and (2,200) and calculate your slope using the slope formula. from there, you plug this in as your m-value in y = mx + b. your y-intercept is 0,100, so b would be 100.