题目内容
In the diagram，the equation of RQ is y=2x-1．If QP is parallel to the x-axis
and the coordinates of P are （8，4），then the distance from P to Q is
- A.4.5
- B.4
- C.5
- D.5.5
D
分析：由于PQ∥x轴，那么Q、P的纵坐标相同，而P（8，4），由此得到Q的纵坐标，而Q在直线 y=2x-1上，代入其中即可求出Q的横坐标，然后就可以求出from P to Q．
解答：∵PQ∥x轴，
∴Q、P的纵坐标相同，
而P（8，4），
∴Q的纵坐标为4，
又Q在直线y=2x-1上，
∴4=2x-1，
∴x=2.5，
∴PQ=8-2.5=5.5．
故选D．
点评：此题是一次函数的综合题，也是利用英语表达式出来的，解题的关键是学生必须理解英语意思，然后熟练利用一次函数的有关知识解题．
分析：由于PQ∥x轴，那么Q、P的纵坐标相同，而P（8，4），由此得到Q的纵坐标，而Q在直线 y=2x-1上，代入其中即可求出Q的横坐标，然后就可以求出from P to Q．
解答：∵PQ∥x轴，
∴Q、P的纵坐标相同，
而P（8，4），
∴Q的纵坐标为4，
又Q在直线y=2x-1上，
∴4=2x-1，
∴x=2.5，
∴PQ=8-2.5=5.5．
故选D．
点评：此题是一次函数的综合题，也是利用英语表达式出来的，解题的关键是学生必须理解英语意思，然后熟练利用一次函数的有关知识解题．
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