Use the technique of Exercise 1 to check whether the points (7, 2) , ( 2, – 3) , and (5, 1 ) are on the same line.
Exercise 1
Find an equation of the line passing through the points (2, 4) and (7, 9). Use the equation to show that the three points (2, 4) , (7, 9) , and (–1, 1 ) are on the same line.
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