Make a table; choose some values for x and find the corresponding values for y.
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x \ | \
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| \
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(x, y) \ | \
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-2 \ | \
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| \
\
| \
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-1 \ | \
\
| \
\
| \
\
0 \ | \
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| \
\
| \
\
1 \ | \
\
| \
\
| \
\
2 \ | \
\
| \
\
| \
3 | \ \
| \
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| \