Question

Plug in a test point to find the region to be shaded

Answer 1

Answers will vary. For example, plugging in the test point (0, 0):

x + y ≤ 900

0 + 0 ≤ 900

0 ≤ 900

The test point (0, 0) holds true for the inequality.

Answer 2

is there a picture we can use to understand this?