4x-4y=-8
-2x+5y=13
solve by substitution...
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Tim's phone service charges $23.06 plus an additional $0.22 for each text message sent per month. if tim's phone bill was $28.56, which equation could be used to find how many text messages, x, tim sent last month?
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Aramp rises 4 feet over a distance of 10 feet. what is the length of the ramp?
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