As you can tell, the next time decreases by three every time. So, the tenth term would be -29.
-2,-5,-8,-11,-14,-17,-20,-23,-26,-29
X=-36
5/6x-1/2x=1/3x
1/3x-3=-9
1/3x=-12
x=-36
The answer is D. It can't be considered a funtion unless each X value only has 1 Y value corresponding to it. In this problem, you see the X value 3 paired with -1 and 1.
Tip:
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