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Math problem solution help

Cost of 2 pens and 3 rulers: 2x+3y=57 Cost of 5 pens and 1 ruler: 5x+y=58 ( Now solve this simultaneous equation) Multiply 2 eq with 3: 3(5x+y)=58*3 This give us: 15x+3y=174 Now: 2x+3y=57 15x+3y=174 (Change the sign) - - - ( Cut +3y with -3y) This give us...
- Talia
- Post #4
- Jan 8, 2012
- Forum: Help, Ideas & Suggestions

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