Question

Analyze what I did incorrectly when I tried to find the angle between the two lines x+2y=8; x-2y=2

Answer 1

\[\frac{.5--.5}{1-.5*-.5} = \frac{4}{5}\]

Answer 2

\[\tan^{-1} {4/5} =.6747\]

Answer 3

The book says it is .9373

Answer 4

.927295 that I get.

Answer 5

http://www.wolframalpha.com/input/?i=arctan%284%2F5%29

Answer 6

\[2 tan^-1(.5)\]

Answer 7

formula is
\[\huge \frac{m1-m2}{1+m1.m2}\]

Answer 8

Oh, I subtracted!

Answer 9

Thank you, lol.

Answer 10

welcome dear