单项选择题

If x+y=16, and if x²-y²=48, then x-y=（）

A. 3
B. 4
C. 6
D. 32
E. 36

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单项选择题

Two buses are 515 miles apart. At 9:30 a. m., they start traveling toward each other at rates of 48 and 55 miles per hour. At what time will they pass each other（）

A、1:30 p.m
B、2:00 p.m
C、2:30 p.m
D、3:00 p.m
E、3:30 p. m

多项选择题

Which of the following is an equation of a line that is perpendicular to the line whose equation is 2x+3y=4 Indicate all such equations.（）

A. 3x+2y=4
B. 3x-2y=4
C. 2x-3y=4
D. 4-3x=-2y
E. 4+2x=3y

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