Find an equation for the straight line \(l\) which passes through \(P\) and \(Q\). Give your answer in the form \(a x + b y + c = 0\), where \(a\), \(b\) and \(c\) are integers.
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The straight line \(m\) has gradient 8 and passes through the origin, \(O\).
Write down an equation for \(m\).
The lines \(l\) and \(m\) intersect at the point \(R\).