Well, It would be hard to write out the formula and everything here so I wrote it out for you! Work shown!
Answer:
c) the size of each exterior angles
I don't know. But I know how to find it. Let's work it out together:
<u>5x = 2x + 20</u>
Subtract 2x from each side: 3x = 20
Divide each side by 3 : <em>x = 20/3</em> or ( 6 and 2/3 ).
-converting to a common denominator
The terms -c of the left side was converted to -4ac/4a to have the same denominator of b^2/4a.
Substitute in y= equation into 2nd equation to start.
(2,5)