Alevel数学题?1.P is the point (7.5) and L1 is the line with equ
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Alevel数学题?
1.P is the point (7.5) and L1 is the line with equation 3x+4y=16
(1).Find out the equation of the line L2 which passes through P and is perpendicular to L2.
(2).Find the point of intersection of the L1 and L2.
(3).Find the perpendicular distance of P from the line L1.
1.P is the point (7.5) and L1 is the line with equation 3x+4y=16
(1).Find out the equation of the line L2 which passes through P and is perpendicular to L2.
(2).Find the point of intersection of the L1 and L2.
(3).Find the perpendicular distance of P from the line L1.
(1)perpendicular to L1吧?
L2:4x-3y=13
(2)(4,1)
(3)d=(/3*7+4*5-16/)/5=5
(1)问就是求过P且与L1垂直的直线L2
(2)问就是求L1与L2的交点
(3)问就是求P到L1的距离
再问: 为什么是(4,1))我怎么是(0.25,-4)
再答: 3x+4y=16 (1) 4x-3y=13 (2) 两式相加得7x+y=29,则y=29-7x,代回2式得4x-87+21x=13,即25x=100,x=4。y=1。
L2:4x-3y=13
(2)(4,1)
(3)d=(/3*7+4*5-16/)/5=5
(1)问就是求过P且与L1垂直的直线L2
(2)问就是求L1与L2的交点
(3)问就是求P到L1的距离
再问: 为什么是(4,1))我怎么是(0.25,-4)
再答: 3x+4y=16 (1) 4x-3y=13 (2) 两式相加得7x+y=29,则y=29-7x,代回2式得4x-87+21x=13,即25x=100,x=4。y=1。
1,P is the point (7,5) and L1 is the line with equation 3x+4
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