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(1)把(3,5)(-4,-9) 代入y=kx+b ①5=3k+b ②-9=-4k+b 由①-②,得 14=7k k=2 把k=2代入① 5=3X2+b b=-1 所以y=2x-1 (2)若點(a,2)在函數影像上 2=2a-1 a=3/2
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