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A friend of mine has asked for help with the following problem: Suppose a scatter diagram has perfect positive correlation and the graph is linear. Is there a proof that the equation of the line is y = a + bx? Paul Marshall School of Education and Professional Development Leeds Metropolitan University Beckett Park LEEDS LS6 3QS Tel: +44 (0)113 2832600 ext 3794 Email: work: [log in to unmask] home: [log in to unmask]