exam Maths Puzzle Numerical Ability

find three consecutive integers such that 3 times the sqaure of the first exceeds the product of the other two by 25

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exam Other Question

Graph each linear equation

2x+y=2

How do you find the RIGHT numbers to subsitute x and y with, how do you know what numbers to use? I need help in finding the solutions to x^2+2(pie)=0.