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posted by Joel Friday, October 12, 2012 at 10:33am.
Write a two-column proof. Given: 7y = 8x – 14; y = 6 Prove: x = 7
If a "two -column proof" looks something like this: 7y = 8x - 14, but y = 6 8x - 14 = 42 8x = 56 x = 7
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