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Selected Exercise Answers · Selected Exercise Answers Section 1.1 1.1.1 b. 2(2s+12t+13)+5s+9(−s−3t−3)+3t =−1; (2s+12t+13)+2s+4(−s−3t−3)=1 1.1.2 b. x =t, y= 1 3 (1−2t)or
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