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Question analysis
This question is asking us to solve for \(a\). In other words, we need to isolate \(\)\(a\)... but we have both \(x\) and \(\)\(y\) in the equation as well.  Maybe the coordinate given can help us getting rid of  \(x\) and \(\)\(y\) in the equation. Then, all we need to do is to make \(\)\(a\) the subject.