The 10th term of an arithmetic sequence is 10 and the sum of the first 10 terms is -35. Find the first term a1, and the common d
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at t = 5:
x(5) = 100
y(5) = 200 - 25
= 175
= 
= 7/4
x(5) = 100
y(5) = 200 - 25
= 175