use PEMDAS from left to right
Parentheses, exponents, multiplication, division, addition, subtraction
We need to find the points that are solutions, that is, the points that lie in the shaded region.
Let's try the ordered pair (1,2). This isn't in the shaded region, so it is not a solution of the system.
The same goes for (-10, 10) and (-2,0).
But when you plot (0,10), it does lie in the shaded region, so it's a solution of the system of inequalities.
MULTIPLY the base times 2, and the height times 2 and add them together to solve for perimeter.
If 200 percent is 11 then 100 is 11/2 which is exactly 5.5.
