exam Maths Puzzle Numerical Ability

Solve each of the following systems by substitution.
5x -2y = -5
y - 5x = 3

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exam Other Question

4x^2 + 34x + 42 The population denisity D (in people per square mile) of a city is related to the distance x, in miles, from the center of the city by D = -45x^2 + 190x + 200, 0 < x<5. Describe th