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x/kg

训练题： 1. 某地长途汽车客运公司规定旅客可以随身携带一定质量的行李，如果超过规定质量，则需要购买行李票，行李票费用 y 元是行李质量 x 千克 一次函数，如图所示。求： （ 1 ） y 与 x 之间的函数关系式； （ 2 ）旅客最多可免费携带行李的质量是多少？. y/ 元. 10. 8. 6. 4. 2. x/kg. o. 解：设这个一次函数为 y=kx+b. 则有： 当 x=60 时 y=6, 当 x=80 时 y=10. 20. 40. 60. 80. 0. Y=1/5x-6. 60.

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x/kg

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  1. 训练题：1.某地长途汽车客运公司规定旅客可以随身携带一定质量的行李，如果超过规定质量，则需要购买行李票，行李票费用y元是行李质量x千克 一次函数，如图所示。求： （1）y与x之间的函数关系式；（2）旅客最多可免费携带行李的质量是多少？ y/元 10 8 6 4 2 x/kg o 解：设这个一次函数为y=kx+b.则有： 当x=60时y=6,当x=80时y=10 20 40 60 80 0 Y=1/5x-6 60

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