book Maths Puzzle Numerical Ability

I need some help on this problem becasue I'm absolutely lost right now. Any help you can offer would be greatly appreciated.
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A contracto

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book Other Question
find the altitude of the triange of the points: A(-2,1) B(4,0) C(5,0), with AB being the base. draw graph for 3x-2y=10 using it y-intercept and slope.