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設Y=KX+B,將(-5,-4)代入得-4=-5K+B B=5K-4① Y=KX+B與Y軸交於(0,B),與X軸交於點(-B/K,0),三角形面積為|B|*|-B/K|/2=5② 將①代入②,再解方程②,得 K1=8/5 B1=4 K2=2/5 B2=-2
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