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因為一次函數的圖像過點(3,5)與(-4,-9),設一次函數的解析式為y=kx+b,所以3k+b=5−4k+b=−9,解得:k=2b=−1,所以一次函數的解析式為y=2x-1,當x=0時,y=-1,所以該函數的圖像與y軸交點的座標為(0,-1).
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