anonymous
  • anonymous
Use substitution to solve the system. −5x - 3y = 21 x = 3y - 9
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
Alright, so first, plug in the second equations for x into the first equations like so: -5(3y - 9) - 3y = 21. Then the -5 into the parenthesis and solve. -15y + 40 - 3y = 21 Then do the rest.
anonymous
  • anonymous
Once you find y, plug it in to one of the equations so you can solve for x.
anonymous
  • anonymous
Thank you

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