题目

英语数学题.请写一下题意和解题过程哈.有加分哈.
注：" < "表示角.
1.the equation of a straight line, L, is 6x-2y+1=0.
a).the straight line P is parallel to L and passes through the origin
write down the equation of P.
2.give that A is (1,6),B is(9,2) C is(9,0)and D is(1,4) (本来有给一个图.大家自己画一下哈.）
a).the parallelogram is reflected in the line y=2.find the coordinates of the image of the point D
b).find the coordinates of the point about which ABCD has rotational symmetry of order 2
3.the co-ordinates of the points A,B snd C are (-7,1), (3,6) and (0,2) respectively
a), given that B is the the mid-point of the line AX, find the co-ordinates of X.
4.give that three points A(-2,7),B(-2,2)and C(6,-4)
a).find the value of sin

提问时间：2021-01-12

答案

1.已知直线L的方程式是6x-2y+1=0 ,假设直线P与直线L平行,并经过原点,求直线P的方程式.因为直线P经过原点 设直线P：y=ax 把直线L转成：y=3x+1/2 斜率k=3 直线P与直线L平行,即直线P的斜率a等于直线L的斜率k：3,所以 直...