You can put this solution on YOUR website! By inspection, you an see these two equations are closely related:
2x + 18y = 22
Divide both sides by 2
x + 9y = 22
Multiply both sides by -1
-x -9y = -11
...
2x + 18y = 22
18y = -2x +22
y = -2/18*x + 22/18
y = -1/9*x + 11/9
...
-x -9y = -11
-9y = x -11
y = -1/9*x + 11/9
...
When x = 11, y = 0
and when x = 0, y = 11/9
...
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