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Solving a System of Linear Equations in Two Variables  Problem 7
Alissa Fong
Alissa Fong
MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
If you can get both of your equations in a 2 x 2 system of equations to be in y = form, then you can solve the system using graphing technology. Here we use a TI graphing calculator, but you could apply these same ideas to any grapher, including an online graphing calculator. Enter your first equation as y 1 = , and enter the second equation as y 2 = . Set an appropriate window (this is not always easy) until you can see the point where the two lines cross this is the solution point that you seek. Then go to the Calculate menu (2nd trace) and select "Intersect." Use the arrows to try to get the spider right on the intersection point, and then press enter three times. You should get the solution point check your work by substituting into both original equations.
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Alissa Fong
M.A. in Secondary Mathematics, Stanford University
B.S., Stanford University
Alissa has a quirky sense of humor and a relatable personality that make it easy for students to pay attention and understand the material. She has all the math tips and tricks students are looking for.
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