SAT数学Problem Solving练习题（3）

>>SAT考试：SAT数学Problem Solving练习题（3）

>>SAT考试辅导：精品课程高端指导

Question #5: Celsius degrees can be transformed in Fahrenheit degrees by using the formula : °C=(5/9)· (°F-32). What is x, if x degrees Celsius is equal to x degrees Fahrenheit?

(a) 40

(b) -40

(c) -20

(d) 20

(e) -30

Answer: x = (5/9)· (x - 32).

9·x = 5·(x - 32).

In conclusion, x = -40C = -40F

Question #6: In the (x,y) plane, what is the equation of the line that passes through the points (0,5) and (4,0)?

(a) y = (5/4) · x + 4

(b) y = (4/5) · x - 4

(c) y = (4/5) · x + 4

(d) y = -(5/4) · x + 5

(e) y = (5/4) · x + 5

Answer: The equation of a line is y = m · x + n

First point, x = 0, y = 5, results in 5 = n

Second point: x = 4, y = 0, means 0 = m · 4 + n, or m = -n/4 or m= -5/4.

In conclusion, y = -(5/4) · x + 5 is the correct answer.

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