作业帮英语数学题.请写一下题意和解题过程哈.有加分哈.
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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
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
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 直线P：y=3X
2.已知ABCD是一平行四边形,A(1,6),B(9,2) ,C(9,0),D(1,4),1）求点D在y=2上反射得到的对应的点,2）求平行四边形ABCD order2 旋转对称的坐标点
1）对应点D'(1,0) 2)order2 不懂
3.已知A (-7,1),B(3,6),C(1,4),
a)假设B是AX的中点,求X的点坐标
设AX所在的直线为y=kx+b ,把A、B坐标代进去,求得方程为y=1/2x+9/2,
A与B在X轴上距离10,B是AX的中点,所以B与X在x轴上的距离也是10,求得x(13,11)
4.已知A(-2,7),B(-2,2),C(6,-4),求sin
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 直线P：y=3X
2.已知ABCD是一平行四边形,A(1,6),B(9,2) ,C(9,0),D(1,4),1）求点D在y=2上反射得到的对应的点,2）求平行四边形ABCD order2 旋转对称的坐标点
1）对应点D'(1,0) 2)order2 不懂
3.已知A (-7,1),B(3,6),C(1,4),
a)假设B是AX的中点,求X的点坐标
设AX所在的直线为y=kx+b ,把A、B坐标代进去,求得方程为y=1/2x+9/2,
A与B在X轴上距离10,B是AX的中点,所以B与X在x轴上的距离也是10,求得x(13,11)
4.已知A(-2,7),B(-2,2),C(6,-4),求sin