Study GuideAlgebra II–Segments Lines and InequaliƟes1. Rectangular Coordinate SystemArectangular coordinate systemhelps us locate points on a graph using numbers. Every point on agraph is described bytwo coordinates, written as anordered pair:(x, y).These coordinates are also calledCartesian coordinates, named after the French mathematicianRené Descartes, who developed this system.When we know:•theslopeandinterceptof a line, or•thecoordinates of two pointson the linewe can determine theequation of that line.Key Terms You Should KnowLet’s go through some important terms that are used when working with coordinate systems.1. Coordinates of a PointOn anumber line, each point corresponds to a single number.Similarly, on acoordinate plane, each point is identified bytwo numbers.These two numbers together are called thecoordinates of the point.Example:The point(3, 4)means:•move3 units along the x-direction•then4 units along the y-directionPreview Mode
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