SAT数学Problem Solving练习题（10）

>>SAT考试：SAT数学Problem Solving练习题（10）

>>SAT考试辅导：精品课程高端指导

Question 10: What is the line in the coordinate plane that is perpendicular to y = m · x + n and passes through the origin?

(a) y = (-1/m) · x

(b) y = (-1/m) · x - 1/n

(c) y = (-m) · x

(d) y = (-m) · x - n

(e) y = (-2m) · x

Answer: The line y = a · x + b, passes through the origin (0,0), so 0 = a · 0 + b, b = 0

(b) and (d) answers excluded, a simple test can be done to find the right answer, e.g. y = 2 · x will be perpendicular to y = -(1/2) · x. The right answer is (a).

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