Substitution Method Critical Thinking Skill: Explicitly assess information and draw conclusions Sometimes using the graphing method can be problematic.

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Presentation transcript:

Substitution Method Critical Thinking Skill: Explicitly assess information and draw conclusions Sometimes using the graphing method can be problematic. Why do you think so?

Substitution Method ex 1: x + y = 5 x = 1 + y Steps: 1. Solve one equation for a variable. 2. Substitute expression from Step 1 into the other equation 3. Solve for first variable 4. Plug answer into 1st equation to find the other variable 5. Write your answer as a point. 6. Check answer by plugging in both values in the other equation

ex 2: a - b = 45a + b = 2

ex 3: 3x + y = 52x - y = 10

ex 4: 2x + 6y = 15x = 2y