суббота, 18 августа 2018 г.

Lesson 25. Drawing curves


EXAMPLE:

Draw y = x2 + 3, using x-values from –3 to 3.

Draw a table
Start with x = 0 and positive x-values first

y = 02 + 3 = 0 + 3 = 3
y = 12 + 3 = 1 + 3 = 4
y = 22 + 3 = 4 + 3 = 7
y = 32 + 3 = 9 + 3 = 12

Now be careful with the negative x-values



–draw axes so that all the points can be plotted
–plot each point
–join up all the points with a smooth curve
–label the curve with its equation

Lesson 25

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