若直线y=1/2x+n与直线y=mx-1相交于点(1,-2)则m+n的值为
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![若直线y=1/2x+n与直线y=mx-1相交于点(1,-2)则m+n的值为](/uploads/image/z/12469004-44-4.jpg?t=%E8%8B%A5%E7%9B%B4%E7%BA%BFy%3D1%2F2x%2Bn%E4%B8%8E%E7%9B%B4%E7%BA%BFy%3Dmx-1%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9%281%2C-2%29%E5%88%99m%2Bn%E7%9A%84%E5%80%BC%E4%B8%BA)
若直线y=1/2x+n与直线y=mx-1相交于点(1,-2)则m+n的值为
若直线y=1/2x+n与直线y=mx-1相交于点(1,-2)则m+n的值为
若直线y=1/2x+n与直线y=mx-1相交于点(1,-2)则m+n的值为
把1,-2 分别带入两个函数
y=1/2x+n中1/2+n=-2
n=-5/2
y=mx-1中m-1=-2
m=-1
m+n=-5/2+(-1)=-7/2
-2=2+n n=-4 -2=m-1 m=-1
m:n=-1:-4=1:4
0=3x+6 x=-2
0=-1/2*-2+b b=-1
直线y=3x+6与直线y=-2/1x+b交x轴于同一点,则b为?两题都要解答 -2=2+n n=-4 -2=m-1 m=-1 m:n=-1:-4=1:4 0=3x+6 x=-