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Posts tagged with coordinates

Coordinates the modern way!

November23

So, you are sitting in a math class, wondering why you are doing Coordinate Geometry? You know the feeling – using (x,y) to show the place of a point on a Cartesian Plane. The Cartesian Plane was named after the French mathematician, Rene Descartes (right). He was a really bright Math guy as well as […]

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Solve 2 Equations = Intersection of 2 Lines

November21

Here is a typical Year 8 or 9 problem where you are asked to solve two equations simultaneously. That is, you need to find where the two lines meet. Of course there are only two possible options for two straight lines: 1. They are parallel and don’t cross over at all or 2. They cross […]

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NCEA Level 2 Algebra Problem. Using the information given, the shaded area = 9, that is:
y(y-8) = 9 –> y.y – 8y – 9 =0
–> (y-9)(y+1) = 0, therefore y = 9 (can’t have a distance of – 1 for the other solution for y)
Using the top and bottom of the rectangle,
x = (y-8)(y+2) = (9-8)(9+2) = 11
but, the left side = (x-4) = 11-4 = 7, but rhs = y+? = 9+?, which is greater than the value of the opp. side??
[I think that the left had side was a mistake and should have read (x+4)?]

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