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Maths linear graph help :/

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acroviak | 08:29 Tue 06th Jan 2009 | Quizzes & Puzzles
2 Answers
Hey.
Im stuck 'again', i know :/.. Well, any help will be much apprechiated and reped as always. Ill fire away:

1. The points A, B and C have coordinates (1,7) (5,5) and (7,9) respectively.
(a) Show that AB and BC are perpendicular
(b) Find equation of BC

(c) The equation of the line AC is 3y=x+20 and M is the mid-point of AB
- Find the equation of the line through M parrellel to AC
- This line intersects BC at the point T. Find the coordinated of T.
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a) For 2 lines to be perpendicular their gradients need to multiply to give -1. can you find the gradients of AB and BC on your own?
b) Substitute coords of B and C into the equation of a str line y=mx + c and solve simultaneously- gives c=-5 and m=2 and equation is y=2x-5
sorry meant divide not multiply for part (a)

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