http://2.bp.blogspot.com/_y62bUPRm_F8/TIWKIbktdsI/AAAAAAAAABE/TemCsmLq4cw/s1600/Page_4_Problem_9.jpg
Value of x is going up by 5 and the slope should be 10/5 or 2 not 10/1. Inserting the points, the final equation will be solved. Y is not equal to 9+10x in the chart
http://1.bp.blogspot.com/_y62bUPRm_F8/TIWOx17uW_I/AAAAAAAAABM/Ukvh50eIPIA/s1600/Page_8_Problem_16.jpg
To have a point it must try to solve both equations. So (1,2) only solves the first one and not the second one
http://3.bp.blogspot.com/_y62bUPRm_F8/TIWPgyUgP7I/AAAAAAAAABU/-9Y0qel_LnM/s1600/Page_19_Problem_22_and_23.
20)shading is correct
should be dotted line and not solid .
#21 the solid line is correct, but the shading should be below the line, not above it.
http://4.bp.blogspot.com/_y62bUPRm_F8/TIWQyeLDOYI/AAAAAAAAABc/9X9WU4CNiug/s1600/Page_21_Problem_20_and_21.jpg
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