Solve by Graphing
1)
http://mathelem.sites.fcps.org/system/files/glossary/coordinate%20plane.gif
2)
http://mathelem.sites.fcps.org/system/files/glossary/coordinate%20plane.gif
3)
http://mathelem.sites.fcps.org/system/files/glossary/coordinate%20plane.gif
4)
http://mathelem.sites.fcps.org/system/files/glossary/coordinate%20plane.gif
5)
http://mathelem.sites.fcps.org/system/files/glossary/coordinate%20plane.gif
6)
http://mathelem.sites.fcps.org/system/files/glossary/coordinate%20plane.gif
7)
http://mathelem.sites.fcps.org/system/files/glossary/coordinate%20plane.gif
8)
http://mathelem.sites.fcps.org/system/files/glossary/coordinate%20plane.gif
9)
http://mathelem.sites.fcps.org/system/files/glossary/coordinate%20plane.gif
10)
http://mathelem.sites.fcps.org/system/files/glossary/coordinate%20plane.gif
11) Solve by substitution. 12) Solve by elimination.