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The method we will use is called the "elimination" or "multiplication-elimination" method. We want to get rid of a variable. Here was the original question:
As we look at these equations, it would be easier to eliminate the variable. So, multiply (ii) by (-1) to get
Now add (i) and (iii) to get
solving for y, we get
replace y with -1 into (i) to get
solving for x, we get
Our coordinate is (-5,-1)