Answers edited by Lea

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• Why can't you have zero to the power of zero?
  
• How do you check your solutions to a systems of equations using the substitution method?
  
• What is Clearing Denominators in Rational Equations?
  
• Question #91885
  
• How do you solve an equation by completing the square?
  
• How do you graph #3x+y<5#?