1.Find the equation of the straight line passing through the
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1.Find the equation of the straight line passing through the mid-point of the line segment joining (-7,1) and (5,10) with slope 3.
2.Find the equation of the straight line L with y-intercept 2 and parallel to a straight line with inclination 45度
3.A (10,6) and B (-2,-12) are two points on a straight line L.
(a) find the equation of L
(b) find the equation of a straight line L1 which passes through the mid-point of AB and is perpendicular to L
2.Find the equation of the straight line L with y-intercept 2 and parallel to a straight line with inclination 45度
3.A (10,6) and B (-2,-12) are two points on a straight line L.
(a) find the equation of L
(b) find the equation of a straight line L1 which passes through the mid-point of AB and is perpendicular to L
1,经过(7,1)与(5,10)的中点且斜率是3
设y=3x+b
求中点(4,11除以2)求的y=3x+(负的13除以2)
2,求解直线L,与Y轴相交于2,且与一条倾斜角度为45度的直线平行
设y=tan45度x+b,j经点(0,2)
即y=x+b
y=x+2
3,A(10,6)与B(-2,-12)都是直线L上的的两点
(1)求解这条直线
设y=kx+b
把A(10,6)与B(-2,-12)带入
k=3除以2 b =-9
(2)求解经过AB的中点并与直线L垂直的直线L1
中点(4,-3)L1的斜率为 k=负2除以3
b=-1除以3
y=kx+b 分别把 k与b带入就可以
再问: 答案呢??
再答: 在里面,把语言换成数学语言就可以 把1中(7,1)改为(-7,1) 中点改为 (-1,5.5) y=3x+8.5
设y=3x+b
求中点(4,11除以2)求的y=3x+(负的13除以2)
2,求解直线L,与Y轴相交于2,且与一条倾斜角度为45度的直线平行
设y=tan45度x+b,j经点(0,2)
即y=x+b
y=x+2
3,A(10,6)与B(-2,-12)都是直线L上的的两点
(1)求解这条直线
设y=kx+b
把A(10,6)与B(-2,-12)带入
k=3除以2 b =-9
(2)求解经过AB的中点并与直线L垂直的直线L1
中点(4,-3)L1的斜率为 k=负2除以3
b=-1除以3
y=kx+b 分别把 k与b带入就可以
再问: 答案呢??
再答: 在里面,把语言换成数学语言就可以 把1中(7,1)改为(-7,1) 中点改为 (-1,5.5) y=3x+8.5
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