Answers edited by Don S.

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• How do I use matrices to find the solution of the system of equations #3x+4y=10# and #x-y=1#?
  
• How would you plot the point #(-4,0)# on the cartesian plane?
  
• What is the order of magnitude of 800?
  
• How to find the scientific notation for a negative number?
  
• How do I find the vertical component of a vector?