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z
Substitution
z
How to do substitution
 #1 Get one of the variables by itself.
 #2 Plug what that equation equals into the other equation.
 #3 Solve for this variable.
 #4 Plug the value you find into the equation from #1.
z
An example for y=
 Solve the system using substitution:
y=5x-1
9x-y=17
z
Answer
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Substitution

  • 2. z How to do substitution #1 Get one of the variables by itself. #2 Plug what that equation equals into the other equation. #3 Solve for this variable. #4 Plug the value you find into the equation from #1.
  • 3. z An example for y= Solve the system using substitution: y=5x-1 9x-y=17