[Algebra] Extra Credit

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  • Okay Class, today we will be learning how to eliminate an equation using substitution.
  • Is this a new subject? I feel like we've heard of this already.
  • I haven't heard of it... :/
  • Well class. First you must write down the equations obviously. For example. X = Y-3 3x + 4y = 7
  • Next, you look and see which one of the variables is by themselves.
  • X = Y - 3 3x + 4y = 7
  • It says "X = Y - 3" Next. You would substitute for "X"
  • Is this correct? 3(y - 3) + 4y = 7
  • Yes you're correct, but would you explain how you got your answer, to the class.
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