Solving systems of equations by substitution, Algebra

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How do you find y & x equal with -4x+y=6 and -5x-y=21

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Add, add - 3a + b - 10 -6c, c -d- a + 9 and - 4c +2a - 3b - 7

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Now let's move into the next technique for solving systems of equations.  As we illustrated in the example the method of substitution will frequently force us to deal with fraction

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