book Maths Puzzle Numerical Ability

how do i solve using a graph for these types of problems? x^3-1=2x^2-3x
or y=2x+10-x^2

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book Other Question

the square of anumber exceeds 11 times the number by 312. find the number. Solve the following system of linear inequalities by graphing and satting coordinates in words..
3x - y < 2 and x + y > 2