exam Maths Puzzle Numerical Ability

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a+b+c=180(for b)

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exam Other Question

Mr. Irwin and Ms. Lippi are math teachers. They have a total of 46 years of teaching. Two years ago Mr. Irwin had taught 2.5 times as many years as Ms. Lippi. How long has each taught? What is the basic method for graphing a linear equation?