Check the picture below.
notice, the pairs in the Unit Circle are the (cosine , sine) pair, which are equivalent to (x , y) values in a cartesian plane.
You can put 10 in the equation:
-10^2 -3*10 = -100 -30 = -130
9.2 could represent the lengh of teds pencil because it is larger than 8.5 which is jans pencil
These two angles are vertical angles. Vertical angles are equal to each other
Step 1: Set the angles equal to each other
3x + 50 = 6x - 10
Step 2: Solve for x
3x + (50 + 10) = 6x + (-10 + 10)
3x + 60 = 6x + 0
(3x-3x) + 60 = 6x - 3x
0 + 60 = 3x
60/3 = 3x / 3
x = 20
Hope this helped!