In the xy-coordinate plane, the graph of y =-x^2+9 intersect

雪天的精灵2022-10-04 11:39:541条回答

In the xy-coordinate plane, the graph of y =-x^2+9 intersects line l at (p,5) and (t,-7). What is
the least possible value of the slope of l ?
A 6
B 2
C -2
D -6
E -10
具体计算过程和答案

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我狂恋香罗梦共回答了13个问题 | 采纳率92.3%: 5=-p^2+9
p^2=4
p=±2
-7=-t^2+9
t^2=16
t=±4
while (2,5) and (4,-7)
slope=(-7-5)/(4-2)=-6
while (2,5) and (-4,-7)
slope=(-7-5)/(-4-2)=2
while (-2,5) and (4,-7)
slope=(-7-5)/(4+2)=-2
while (-2,5) and (-4,-7)
slope=(-7-5)/(-4+2)=6
the answer: A B C D; 1年前

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在xy平面里,P、Q为纵坐标相同的两点,并且P、Q两点在抛物线y=x^2-3x-40上.求线段PQ中点的横坐标.
自己参考吧：Xm=1/2(Xp+XQ).利用抛物线的symmetry（对称性）,Xm=1/2*2*[-(-3/2)]=1.5

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SAT数学题求翻译及解题过程Rectangle ABCD lies in the xy-coordinate plane SAT数学题求翻译及解题过程 Rectangle ABCD lies in the xy-coordinate plane so that its sides are not parallel to the axes. What is the product of the slopes of all four sides of rectangle ABCD? (A) -2 (B) -1 (C) 0 (D) 1 (E) 2 山东足彩1年前2: 秋隼共回答了24个问题 | 采纳率95.8%

xy坐标系中的矩形ABCD,其边与坐标轴均不平行.四条边的斜率乘积是多少?
矩形么,四条边有以下的关系
AB⊥BC,CD⊥DA
这个表示
AB的斜率 x BC的斜率应该为 -1,CD的斜率 x DA的斜率也应该为 -1,
即如果AB的斜率是 s,那么BC的斜率一定是 -1/s
那么两个-1相乘就是1咯,选D

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In the xy-coordinate plane,line M is the reflection of line In the xy-coordinate plane,line M is the reflection of line L about the x-axis.If the slope of line m is -4/5,what is the slope of line 别只讲答案,或者哪条定律,求讲解怎么推导验证出来的谢谢 laowantong20021年前1: yuemingrinuan 共回答了18个问题 | 采纳率83.3%

答案应该是-4/5
因为他说line m是4/5,也就是纵坐标比横坐标是四比五,然后line l 是刚好在x轴反射,所以纵坐标变号,横坐标不变,所以是负四比五

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In the xy-coordinate plane,lines L and Q are perpendicular.I In the xy-coordinate plane,lines L and Q are perpendicular.If line L contains the points (0,0) and (2,1),and line Q contains the points (2,1) and (0,T),what is the value of 李财狂_vv1年前3: mythwdb 共回答了11个问题 | 采纳率100%

L和Q 垂直.
L 过（0 0）（2,1）所以L 这条线是y=0.5x,所以Q的斜率是-2,对吧.因为垂直斜率是负倒数.
Q过（2,1）（0,t）所以-2(2)+t=1 推出t=5
那个题我帮你答了,自己去链接看.

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SAT数学题求解释In the xy-coordinate plane, the graph of x = y*y -4 SAT数学题求解释 In the xy-coordinate plane, the graph of x = y*y -4 intersects line l at (0, p) and (5, t). What is the greatest possible value of the slope of l?（求大神救救我TAT,这题是肿么回事.） sy_231年前1: 山家湖共回答了20个问题 | 采纳率100%

这是求斜率的最大值问题,可设此直线l的方程为y=kx+b,此直线又与曲线x=y^2-4交于(0,p)和(5,t),则可得：0=p^2-4,5=t^2-4,解得p=±2,t=±3,另外此两点在直线上,故可得：
p=b,5k+b=t,即k=(t-p)/5,故k的最大值是(3+2)/5=1

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In the xy-coordinate plane, the graph of y =-x^2+9 intersect

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