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03_systems_elimination.notebook
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January 30, 2015
Warm upSolve the system of equations using substitution. CHECK YOUR ANSWER using graphing.
y = x - 10
5x - y = -6
x + 6y = 14
-x + 3y = 4
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Using elimination to solve systems of equations.
3x - 2y = 4
4x + 2y = 10Look for terms that are opposites, then add the equations together.
7x = 14x = 2 Solve the equation for the variable.
Now use the value for x to find y.
3(2) - 2y = 4
6 - 2y = 4
-2y = -2
y = 1Don't forget to check your solution!
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8x + y = 1
8x - 3y = 3
Sometimes you don't have opposite terms.
So, make them opposite -
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2x + 3y = 5
5x + 4y = 16
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4x - 3y = 12
x + 2y = 14
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Homework
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