Answer:
The last term on the paper after 50 students = 
Step-by-step explanation:
The general term of the equation:
Here, the first term = 1
Second term = 2(1) + 1 = 3 = 4 - 1 = 
Third Term = 2(a2) + 1 = 2(3) + 1 = 7 = 8 -1 = 
Fourth term = 2( a3) + 1 = 2(7) + 1 = 15 = 16 - 1 = 
Continuing this way, we get
Last term : 
So, the 50th term of this sequence is

Hence, the last term on the paper after 50th student changes it = 
Each ordered pair is (x,y). Determine the coordinates by substitution.
for (15,y):
y=1/3 * 15 - 9
y=-4
for (x,-6):
-6=1/3x -9
1/3x=3
x=9
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