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 Depdendent Variable

 Number of equations to solve: 23456789
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 Solve for:

 Dependent Variable

 Number of inequalities to solve: 23456789
 Ineq. #1:
 Ineq. #2:

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 Solve for:

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# Solving Linear Equations

Example: Solve 3.1(x – 5) = 2x – 5

 STEP 1: Enter one side of the equation under Y1 and the other side of the equation under Y2. Let Y1 = 3.1(x – 5) and Y2 = 2x – 5 Go to and enter both equations. STEP 2: Then press . NOTE: To find the intersection, you have to see the point where the two lines intersect. If you cannot see this point, then you will need to change the size of your viewing window. STEP 3: The solution to the equation will be the point where the two lines intersect. To find this point of intersection, press which is the CALCULATE menu. Arrow down to 5: intersect. Then press . STEP 4: The calculator asks for the first curve. Use the arrow keys to move the cursor so it is on one of the lines (it does not matter which one). Then press . The cursor should jump to the other line. If it does not, use the arrow keys to move it to the other line. Then press . Press again for the guess. STEP 5: The calculator will then find the point where the two lines intersect. Since you are solving the equation for x, you just want the x-coordinate of the point. The solution to this equation would be x = 9.55 Checking the Solution Step 1: To check the solution, press (next to the clear key) and arrow over to Y-VARS. Select 1:Function and press Step 2: Select the y- variable that you entered one side of the equation under and press . Press again. The calculator stores the x-coordinate of the point of intersection in x and evaluates 3.1(x-5) for x = 9.55. Step 3: Repeat Step 1 and select the y- variable for the other side of the equation you entered and press . Then press again. The calculator now evaluates 2x-5 for x = 9.55. The two values should be the same. This means the solution x = 9.55 checks.