![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
Observe the figure, then make a table of ordered pairs.
\| \
x \ | \
\
–4 \ | \
–3 | \–2 | \–1 | \0 | \1 | \2 | \
| \
y \ | \
\
–2 \ | \
–1 | \0 | \1 | \2 | \3 | \4 | \
The difference of the x values is 1, and the difference of the y values is 1.
\The difference in x values is twice of the difference of y values.
\Then the equation of the function ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=185b5cc49f37a67973c585b569932208.png\")
.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The solution of the equation is ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=185b5cc49f37a67973c585b569932208.png\")
.