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Algebra

What is the answer to 7x+2y=16 and -21x-6y=24 using the substituion method?

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  1. There's either a typo, or it's a trick question. Take a look at the equations.

    7x+2y=16
    -21x-6y=24

    If you divide the 2nd by -3, you get

    7x+2y = -8

    There is no solution, since the left sides are the same, but the right is different. The lines are parallel.

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