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 fr

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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 fr
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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 fr
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.
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可怜小妹的数学初中水平还不够,看来勘定英文是不够的!555555555555555555555555
还有一个公式：gradient =y-step/x-step=1/-m
给出3个点的坐标,如何证明他们形成的角是直角?（use m1m2=-1 to explain it）

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 fr
先翻成中文
P(7,5) 直线L1方程为 3x+4y=16
1.直线过P点且与L1垂直 求该直线方程
2.求L1与L2的交点
3.求P点到直线L1的距离
解1.L1:3x+4y=16
y=-3x/4+4
斜率为 -3/4
因为与 L1垂直 则L2的斜率为4/3
所以设L2方程为y=4/3x+b
p点代入 b=-13/3
所以L2直线方程为 y=4x/3-13/3
2.联立方程组
y=-3x/4+4
y=4x/3-13/3
解出 x=4,y=1
所以交点坐标为(4,1)
3.点(7,5)到直线距离 运用公式
距离=|3x1+4y1-16|/(√(3^2+4^2)=|3*7+5*4-16|/5=5
gradient =y-step/x-step=1/-m
这个方程的意思就是斜率=(y1-y2)/(x1-x2)=1/(-m)
要证明 形成的角是直角
只要 斜率乘积=-1

直角就是直角,需要理由吗

不是我不想解决，而是你的问题不清楚

翻译一下
P是坐标为(7，5)的点。直线L1方程为3x+4y=16
(1),求过点P且垂直L1的直线L2的方程。
(2),求L1和L2的交点。
(3),求点P到L1的距离。
答案
1.4x-3y=13
2.(4,1)
3. 5
过程
1.先求直线1的斜率，y=-3/4+4,斜率为x的系数，-3/4
两线垂直，...

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翻译一下
P是坐标为(7，5)的点。直线L1方程为3x+4y=16
(1),求过点P且垂直L1的直线L2的方程。
(2),求L1和L2的交点。
(3),求点P到L1的距离。
答案
1.4x-3y=13
2.(4,1)
3. 5
过程
1.先求直线1的斜率，y=-3/4+4,斜率为x的系数，-3/4
两线垂直，则斜率之积为-1，可知线2的斜率为4/3
过(7,5),设方程为y=4/3x+b,代入x=7,y=5,得b=-13/3
整理可得线2方程为4x-3y=13
2.线1和线2联立，解出x,y的值，即为交点坐标
3.点到直线的距离公式：若点为A(m,n),线为Ax+By+C=0
则A到线的距离为｜Am+Bn+C｜/√￣（A^2+B^2）
代入即得答案为5

收起

昏~ 看的不咋明白~
就求出3个点间的距离~满足钩股定理的就是直角
D^2=(X1-X2)^2+(Y1-Y2)^2

这是什么意思#24 汗~~

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 fr is not the point. Point P is on the line y=5x+3.The coordinates of point Q are(3,-2).If M is the midpoint of PQ,then M must lie on the liney=5x-7怎么算的? 英语翻译On the number line,point P has coordinate 1/2,and point Q has coordinate 2.If point R is 1/4 of the way from P to Q,what is the coordinate of 我不知道what is the coordinate of R这句是什么意思我认为R是3/8但没有这个选 一道SAT数学题,真是非常惭愧,但是为求得更方便的解题方法,偶还是来也...On the number line,point P has coordinate 1/2,and point Q has coordinate 2.If the point R is 1/4 of the way from P to Q,what is the coordinate of A.3/4 B. SAT2010年5月真题有一道数学题看不懂但是有一句话我看不懂.题目是这样的……On the number line,point P has coordinate 0.5 ,and point Q has coordinate 2.If point R is 1/4 of the way from P to Q,what is the coordinate of 就 1 The line l has equation 2x-y-1=0.The line M passes through the point A (0,4) and is perpendicular to the line l.(a) Find an equation of m and show that the lines l and m intersect at the point P (2,3).the line n passes through the point B(3,0) and 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 英语翻译1． Two planes,P and Q ,intersect along the line P .The point C is given in the plane P ,and the point C in the plane Q ; neither of these points lies on the straight line P .Construct an isosceles trapezoid ABCD (with AB‖CD ) in which 英语翻译on the number line,point p has coordinate 1/2,and point Q has coordinate 2.if . what is the point of working what is the freezing point of platinum? What is the point to be happy The real point living is good 有没有here is the point there is little point in the later As shown in figure 1,point C is on the segment BG and quadrilateral ABCD is 请翻译：The range is the two-point set ｛0,1｝.