Determine whether three points are collinear, given the gradient of one, and the angle a second line segment.

Instructional exercise consisting of question 9 from the first paper of the 2015 SQA New Higher Mathematics examination.

Where appropriate the alternative methods for solving the problem are also given.
Set out in stages of 'try then check' the worked solution to each part of the question.
Including indications of where each mark is allocated, and the requirements for that mark, according to the marking scheme.

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