`x + y le 9, x gt y, xge 0 `

Answer

N/a

Explanation

First inequation : `x + y le 9`
Corresponding equation : ` x + y = 9`
This line passes through the points A(9, 0) and B (0, 9). Join AB. At point (0, 0), from the inequation, `0 le 9` (True)
`:.` The solution of this inequation is that region of XY-plane divided by line AB in which (0, 0) lies.
Second inequation : ` y gt x`
Corresponding equation : ` y = x `
This line passes through the points O(0, 0) and C(9, 9). Join OC by the dotted line.
At point (9, 0), from the inequation, 0 gt 9 (False) `:.` Solution of this inequation is that region of XY-place divided by line OC in which (9, 0) does not lie. `xge 0` is the region of Y-axis and its right in XY-plane.

The common solution of three inequations is shown by the shaded region.