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As the name implies, substitution simply involves you "substituting" one variable in for another so that you can solve for that variable.
Let's solve the given system by substitution
Start with the given system
into the first equation. In other words, replace each
. Notice we've eliminated the
variables. So we now have a simple equation with one unknown.
Combine like terms on the left side
Subtract 16 from both sides
Combine like terms on the right side
Divide both sides by -7 to isolate x
Now that we know that
, we can plug this into
So our answer is
which forms the ordered pair