Name: Texas Instruments TI-83-Plus
Brand: Texas Instruments
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Chapter 5: Linear Systems Section 2: Using Algebra

Observations (continued)

Observation 2

Students are asked if the same left-hand sides of the equations can

equal different right-hand sides. They should be able to reason this

out using their number sense. They can then verify their answer

using algebra. They will see the verification using the elimination

method on the following screens in the application.

The second equation is multiplied by

1 and then the equations are

added. Multiplying by

1 was chosen to avoid sign errors.

Some students will want to immediately subtract the two equations.

This is also correct, but they need to be very careful to subtract each

term!

Observation 3

Students see the elimination steps on the following screens in the

application. The result screen is given below.

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