SAT数学备考经典模拟题训练39
>>SAT数学模拟题:SAT数学备考经典模拟题训练39
练习题内容
· 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
解析
o Answer: x = (5/9)· (x - 32).
9·x = 5·(x - 32).
In conclusion, x = -40C = -40F
o 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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