book Maths Puzzle Numerical Ability

The exact question is 'Write the equation of the horizontal and vertical lines that pass through the given ordered pair.' The ordered pair is (7,2), also i have many more of this t

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#1
Graph and solve the system
y<-x2+4 (2 is x cubed,< is less than or equal to)
y>x-2 (> is greater than or equal to) please show me howto combine like terms in each of these expressions, thanks
(10x^3+6x^2+4x)-8x^3+2x^2-3x
(5x^2+6x+8)(6x^3+2x^2-4x)
8x^2+6x^3+2x+5x