已知动点P(x,y)满足,x2+y2−4x+6y+13+x2+y2+6x+4y+13=26,则y−1x−3取值范围(
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已知动点P(x,y)满足,
x
由于动点P(x,y)满足,
x2+y2−4x+6y+13+ x2+y2+6x+4y+13= 26,化为 (x−2)2+(y+3)2+ (x+3)2+(y+2)2= 26, 设A(2,-3),B(-3,-2),则|AB|= (−3−2)2+(−2+3)2= 26. ∴动点P(x,y)在相等AB上, 设k= y−1 x−3,则k表示动点P(x,y)与M(3,1)连线的斜率. 又kMA= −3−1 2−3=4,kMB= −2−1 −3−3= 1 2. ∴ 1 2≤k≤4. ∴ y−1 x−3∈[ 1 2,4]. 故选C.
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