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1. Press the Y= key.

2. For Y1, enter the left side of the equation.

3. For Y2, enter the right side of the equation.

Note: You have to write the equations so that x + y = 7 becomes y = 7 - x or 2x + 4y = 10 becomes y = (10-2x)/4. You can only have one independent variable, and it has to be called X. The dependent variable will be called Y.

2. Access the Equation Solver by pressing MATH->ALPHA->APPS. In case you don't know, what you're doing is accessing the Math menu and selecting option B by inputting the letter B (you do that by pressing ALPHA to activate the alphanumeric keyboard, then by pressing the "APPS" key, which represents the letter B.")

3. If you don't see the phrase "EQUATION SOLVER" at the top, scroll up, then press the CLEAR key.

4. Press VARS.

5. Scroll to the right.

6. Press ENTER twice.

7. Type in "(X)-".

8. Repeat steps 4 and 5.

9. Scroll down one option.

10. Hit ENTER.

11. Type in "(X)".

12. Press ENTER.

13. Type in your calculation of X.

14. Make sure the bound is {-1E99, 1E99}.

15. Place the cursor on the X= line, if it isn't already there, then press ALPHA-ENTER.

16. Repeat step 13 if you have multiple solutions.

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# Calculators How to check your answers using a TI-84

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