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A straight line goes through the points (p,q) and (r,s), where p + 2 = r, q + 4 = s. Find the gradient of the line.

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Gradient = \[\frac{y_{2} - y_{1}}{x_{2} - x_{1}}\]

                 = \[\frac{q + 4 - q}{p + 2 - p}\]

                 = \[\frac{4}{2} = 2\]