Asked by don

Let f(x) = x+1 and g(x) = -(1/5)x +3

How can we find the size of angles formed by these two lines
Answered by Reiny
Did you know that the slope of a line is the tangent of the angle that this line makes with the x-axis ?

so the slope of y = x+1 is 1, so it makes a 45° angle with the x-axis ( inverse tan(1) = 45)
the second line has slope -1/5, so it makes an angle of 168.69°

so the angle between the lines is 168.69-45 or 123.69°
Answered by don
Let f(x) = x+1 and g(x) = -(1/5)x +3

How can we find the size of angles formed by these two lines
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