Answer:
45
Step-by-step explanation:
180 - 135 = 45
The measure of angle 2 is 45.
By Pythagoras Theorem,
the length of the other leg= (12^2-9^2)^1/2
hope this helps
So,

1. Graph each inequality separately.
2. Choose a test point to determine which side of the line needs to be shaded.
3. The solution to the system will be the area where the shadings from each inequality overlap one another (purple area)
As for the system of inequalities we say it's unbounded.
The final answer that i got from this was -x-13
X = k x y
21 = k x 3
k = 7
x = 7y
x = 7(10)
x = 70