A small rectangular swimming pool in a fitness centre measures 4 metres by 10 metres. It is surrounded by a path of width x mete
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to get the equation of a line, we simply need two points, say for the Red one ... notice in the graph the lines passes through (0,2) and (-1,6), so let's use those
now, for the Blue one, say let's use hmmm it passes through (0,2) and (1.6)