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# C1 questions... watch

1. The points A (-4, -2) B (6, 4) and C (4, -4) are the vertices of triangle ABC. Point D is the midpoint of AB

Find an equation for the line passing through A and B in the form ax+by+c=0 where a b and c are intergers.

I got this to be -5x - 3y -2 = 0 but then the next question confused me...

Show that CD is parrallel to the line with equation 10x - 6y +7 = 0 because CD'S equation is the one i worked out above yet i thought if they were parallel they would have the same gradien but they do not so im confused.

Can anyone help?

Thanks
2. (Original post by KaosLisa)
The points A (-4, -2) B (6, 4) and C (4, -4) are the vertices of triangle ABC. Point D is the midpoint of AB

Find an equation for the line passing through A and B in the form ax+by+c=0 where a b and c are intergers.

I got this to be -5x - 3y -2 = 0 but then the next question confused me...

Show that CD is parrallel to the line with equation 10x - 6y +7 = 0 because CD'S equation is the one i worked out above yet i thought if they were parallel they would have the same gradien but they do not so im confused.

Can anyone help?

Thanks
U got equation for AB or CD? If it's CD's equation, I guess u were wrong somewhere.
3. What ive typed out is the question thats all i have....
4. (Original post by KaosLisa)
The points A (-4, -2) B (6, 4) and C (4, -4) are the vertices of triangle ABC. Point D is the midpoint of AB

Find an equation for the line passing through A and B in the form ax+by+c=0 where a b and c are intergers.

I got this to be -5x - 3y -2 = 0 but then the next question confused me...

Show that CD is parrallel to the line with equation 10x - 6y +7 = 0 because CD'S equation is the one i worked out above yet i thought if they were parallel they would have the same gradien but they do not so im confused.

Can anyone help?

Thanks

I worked it though, the gradient of the line 10x - 6y + 7 = 0 is parallel to CD.
AB is a different line altogether.
5. yes the first part is 0 = 3x -5y +12

then work out midpoint (D) and find gradient CD.
rearrange 10x - 6y + 7 = 0 to find the gradient of this line. the two shoudl be equal
6. I don't think that's right either. I got a different constant term.
7. sorry typo replace 12 by 2

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