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Mathematics 9 Online
OpenStudy (mike1015):

The coordinates of A, B, and C in the diagram are A(p, 4), B(6, 1), and C(9, q). Which equation correctly relates p and q?

OpenStudy (anonymous):

nice

OpenStudy (mike1015):

@imqwerty can you help with this

imqwerty (imqwerty):

sure dude :) but where the diagram? :o

imqwerty (imqwerty):

pls post the diagram which is given with the question :)

OpenStudy (mike1015):

oh sorry give me a moment

imqwerty (imqwerty):

alright

OpenStudy (mike1015):

imqwerty (imqwerty):

AB and BC are perpendicular to each other and the product of slopes of perpendicular lines is equal to \(\color{orangered}{-1}\) so 1st we find out the slopes of AB and BC we will use this info to find the slope- the slope of a line passing through 2 points say \((x_1,y_1)\) and \((x_2,y_2)\) is given like this- \(slope=\large \frac{y_2-y_1}{x_2-x_1}\) slope of AB- it passes through A(p, 4) and B(6, 1) slope of AB= \(\large \frac{1-4}{6-p}=\frac{-3}{6-p}\) slope of BC- it passes through B(6, 1) and C(9, q) slope of BC= \(\large \frac{q-1}{9-6}=\frac{q-1}{3}\) the product of slopes of AB and BC must be -1 so \(\Large \frac{-3}{6-p} \times \frac{q-1}{3}=-1\) simplify from here and then you will get the relation between p and q :) the relation is nothing but an expression containing p and q both in it

OpenStudy (mike1015):

ok ty that was a lot of help man

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