三点a(2,-4)b(x,-9)c(1,1)共线,求x

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三点a(2,-4)b(x,-9)c(1,1)共线,求x三点a(2,-4)b(x,-9)c(1,1)共线,求x三点a(2,-4)b(x,-9)c(1,1)共线,求x设直线y=ax+b代入两点:-4=2a

三点a(2,-4)b(x,-9)c(1,1)共线,求x
三点a(2,-4)b(x,-9)c(1,1)共线,求x

三点a(2,-4)b(x,-9)c(1,1)共线,求x
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