Transcription of Analytic Geometry - Whitman College
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Analytic Geometry - Whitman College
1 Analytic GeometryMuch of the mathematics in this chapter will be review for you. However, the exampleswill be oriented toward applications and so will take some the (x, y) coordinate system we normally write thex-axis horizontally, with positivenumbers to the right of the origin, and they-axis vertically, with positive numbers abovethe origin. That is, unless stated otherwise, we take rightward to be the positivex-direction and upward to be the positivey-direction. In a purely mathematical situation,we normally choose the same scale for thex- andy-axes. For example, the line joining theorigin to the point (a, a) makes an angle of 45 with thex-axis (and also with they-axis).
points (1,−2) and (3,5) has slope (5+2)/(3− 1) = 7/2. EXAMPLE 1.1.1 According to the 1990 U.S. federal income tax schedules, a head of household paid 15% on taxable income up to $26050. If taxable income was between $26050 and $134930, then, in addition, 28% was to be paid on the amount between $26050
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