Answers edited by Kilwee

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• Out of the 150 students at a summer camp, 72 signed up for canoeing. There were 23 students who signed up for trekking, and 13 of those students also signed up for canoeing. Approximately what percentage of students signed up for neither?
  
• How do you solve 3x+2y = -9 and -10x + 5y = - 5?