三点a(2,-4)b(x,-9)c(1,1)共线,求x
人气:238 ℃ 时间:2020-03-28 20:39:59
解答
设直线y=ax+b
代入两点:-4=2a+b
1=a+b
a=-5,b=6
y=-5x+6
当y=-9时,-9=-5x+6
x=3
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