Finding the equation of a line using the TI-30XS MultiView Calculator
Your calculator will calculate the slope and the y-intercept given any two points on the line. However, your calculator uses the letter a for the letter m. Hence, the equation of the line is y = ax + b. On the TI-30XS MultiView calculator, you calculate a and b as follows:
To enter the two points (2, 7) and (5, 13) into the calculator:
1. Press 
(twice).
2. Arrow down to highlight 4: Clear All.
3. Press 
to clear out any data that is left over from a previous problem.
4. Enter the x values of each point in L1 and the y values of each point in L2 using the arrow keys to move between the two columns.
5. Press 
. (The word stat is above the 
key)
6. Arrow down to highlight: 2: 2-Var Stats
7. Press
8. For xDATA highlight L1
9. Press
10. For yDATA highlight L2
11. Press
12. Arrow down to highlight CALC
13. Press
14. Arrow down several times to highlight D: a=2
15. Arrow down once more to highlight E: b=3
16. Once you determine the values of a and b, write the equation in the form y = ax + b. In this example, the equation of the line is y = 2x + 3.