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S 4 maths - variation 20點

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圖片參考:http://imgcld.yimg.com/8/n/HA00416797/o/701004190176013873385511.jpg 請詳細回答以上兩題,謝謝幫忙!

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1] a) Let C=hN+k ,where h,k are non?zero constant. For N=15 and C=162: 15h+k=162______(1) For N=20 and C=211: 20h+k=211______(2) (2)?(1): h=49/5 and k=15 ∴C=(49/5)N+15 c) For N=25: C=(49/5)(25)+15=260 Reqired bill is $260 d) Minimum charge of bill = (49/5)(0)+15 = $15 . 2] 圖片參考:http://i826.photobucket.com/albums/zz190/fai109/550.jpg

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