book Maths Puzzle Numerical Ability

through (8,-3)
perpendicular to -5x-3y=-31

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I need help,here's an example:

Rewrite the equation so that y is a function of x.

-4x + y = 9
-3y + 18x = 12

Please keep it simple I'm only 12. Thanks, Tony Please help me solve this geometry problem: There is a shape consisting of 5 sides,the left side is straight and measures 10 cm, across the top measures 6cm, the right side goes do