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y-3與x成正比例 y-3=kx y=kx+3 x=2時,y=7. 7=2k+3 k=2 y=2x+3 平移則x係數不變 所以是y=2x+b 過(2,-1) 即x=2時y=-1 -1=4+b b=-5 所以是y=2x-5
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