I'm learning how to use Excel. My teacher asked us to solve. she posted this "Since we are plotting a = F/(M+m), the slope of the equation (the factor multiplying x) is 1/(M+m). Calculate this experimental (M+m) and report it here: M + m = ______ (do not forget units)" Can someone please help me understand.

File Home Insert Page Layout Formulas Data Review View PivotTable Table Picture Clip Shapes SmartArt Screenshot Column Line Pie Bar Area Scatter Other Line Column Win/Lo Art Charts Tables Illustrations Charts Scatter parklines B8 =B3*9.8/1000 A B C D E F G K 1 Acceleration of an air track glider in m/s^2 2 accelerating mass (g) 5 10 15 20 4 acceleration, trial 1 0.1337 0.2855 0.4331 0.5777 acceleration, trial 2 0.1343 0.2846 0.4326 0.5823 6 acceleration, trial 3 0.1368 0.2850 0.4333 0.5824 7 average acceleration 0.1349 0.2850 0.4330 0.5808 All Chart Types... 8 Force (N) 0.049 0.098 0.147 0.196 9 average acceleration 0.1349 0.2850 0.4330 0.5808 10 11