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很簡單 設y=kx+b 帶到已知關係式得到 4(-kt+b)-2(kt+b)=3x+18 化簡得 -6kt+2b=3x+18 觀察等號左右兩式得 -6k=3 2b=18 所以k=-0.5 b=9 所以y=-0.5x+9
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