Question

What angle does the line P(7,-4) and Q(1,6) make with the positive x-axis?

Answer 1

aractan(10/-6)

Answer 2

(7,-4)
-(1, 6)
-------
<6,10> = 2<3,5>

Answer 3

<3,5>
<1,0>
------
3+0 = 3

\[cos(a)=\frac{3}{\sqrt{34}}\]
\[cos^{-1}(\frac{3}{\sqrt{34}})\ :)\]

Answer 4

just to be different lol

Answer 5

The answer in the back of the book says it's 122

Answer 6

i dropped a negative, doh!

Answer 7

it should be about 59 degrees or so

Answer 8

it is in 2nd quardant
take arc tan(10/6)
then 180-arc tan(10/6)

Answer 9

thats better

Answer 10

Since it's in the 2nd quadant you have to subtract 180?