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Solution 4.1:6a

From Förberedande kurs i matematik 1

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If we write the equation as

(x−0)2+(y−0)2=9

we can interpret the left-hand side as the square of the distance between the points (x,y) and (0,0). The whole equation says that the distance from a point (x,y) to the origin should be constant and equal to 9=3 , which describes a circle with its centre at the origin and radius 3.


Image:4_1_6_a.gif
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