book Maths Puzzle Numerical Ability

When graphing a linear inequality, how do you know if the inequality represents the area above the line?

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book Other Question

I have a PROBLEM THAT SAYS ;;;;; TWICE THE DIFFERENCE OF A NUMBER AND 8 IS EGUAL TO THREE TIMES THE SUM OF THE NUMBER AND 3 : fIND THE NUMBER;;;;; i SET UP THE PROBLEM LIKE THIS 2( Perform the indicated operation

(-3x^4 + 4x^2 - 7x + 10) - (-2x^3 + 6x^2 - 5x + 3)