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a. A line L1 passes through the points (3,3) and (5,7), Find the equation of L1 in the form y = mx + c, where m and C are constants. (3 marks)
b. Another line L2 is perpendicular to L1 and passes through -2 3. in i. the equation of L2 (3 marks) ii. the x-intercept of L2 (1 mark)