Answer:
(-9, -4)
Step-by-step explanation:
Answer:
One interior angle is 50°.
Exterior angle is 95°.
Step-by-step explanation:
For this case, the first thing we must do is define variables.
We have then:
x: number of pens
y: number of pencils
We now write the system of inequations:

The solution to the system of inequations is given by the shaded region.
Note: see attached image.
You need to know atleast 2 of three sides from a triangle, or 1 side and 1 angle of a triangle. Then you can use trigonometry to find the angle needed.