How to Find the Slope and the Intercept with the Casio fx-991ES PLUS (linear regression)

To calculate the slope and the intercept all you need is to follow these steps:

1. Press mode and the 3 to choose STAT mode.
2. Press 2 for A+BX ( equivalent to y = mx + c or y = mx + b or y = kx + m or y = ax + b )
3. Enter you data points (example below)
4. Press AC (orange)
5. Press “SHIFT” and the key 1
6. Press the key 5
7. Press the key 1 for A (intercept)
8. Repeat steps 5 and 6 and press the key 2 for B (slope)
   Scroll down for the linear equation of the table below.

f(x)= 0.0155x+0.24

To calculate the standard deviation to for x (sx) and y (sy)

1. Press SHIFT and the key 1
2. Press the key 4
3. Press the key 4 or 7 for the sx and the sy accordingly

Source fx-991ES PLUS User’s Guide

Related to Enzyme Kinetics (Michaelis-MentenFormula) and Lineweaver-Burke diagram