The graph equation is .
(Substitute 1 for x and 2 for y)
(Subtract: )
()
Since (1, 2) is a solution.
The point (1, 2) lies on the graph equation.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
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. ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=71930e4c69ad5c11c4e998d9ccc08e39.png\")
(Substitute 1 for x and 2 for y) ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2264df2d5ac657de366368c48df06512.png\")
(Subtract: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c75f2869cf7dce983438f39036e1cb5e.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=89972f612f2585bffc123df8462e266d.png\")
(![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c2d90d6fb4f423244dedd8069e87eb8c.png\")
)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")