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

determine graphically the vertices of the triangle, the equation of whose sides are given as y=x;y=0;2x+3y=10. interpret the results 20x = x^3 - x^2

please help to solve! Thank you