Which of the following lines are parallel?
?
A. ?y = -5x and 10x + 2y = 6
B. ?y = -x and 2y = 2x
C. ?y = 3x + 6 and 3y = x + 2
D. ?y = 5 and x = 3
E. ?None of the above.
Answer: A
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Simplify the radical expression. Assume that all variables represent positive real numbers.
? 
A. 
B. 
C. 
D. 