exam Maths Puzzle Numerical Ability

find the slope of any line parallel to the line through points (15,1) and (4,2)

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Mr. Santos invested 50,000 pesos, part of which at 5% per year and the rest at 6% per year. his annual income from the two investments was 2000 pesos. How much did he invest at each rate? Please help! Verify that the points (0, 0) and (a, 0) and (a/2,a/2) form the vertices of a right triangle. Work in terms of a.