# Math question: Please HELP

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Thread starter 3 months ago
#1
ABCD is a trapezium where A is the point (1,-2), B is the point (7,1) and C is the point (3,4).
DC is parallel to AB
AD is perpendicular to AB
Find the equation of the line CD.
--- I've tried drawing a graph but I just don't understand how to get the point D -- Please help.
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3 months ago
#2
Can you upload what you sketched?
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Thread starter 3 months ago
#3
S

(Original post by mqb2766)
Can you upload what you sketched?
sorry, it's fine I think i figured it out now. I did the equation of AB as its parallel, then figured out the equation of DC. And used trial an error to find D. XD
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3 months ago
#4
(Original post by Amelia_P)
S

sorry, it's fine I think i figured it out now. I did the equation of AB as its parallel, then figured out the equation of DC. And used trial an error to find D. XD
Shouldnt have needed trial and error, but its worth doing if you can't come up with another method.
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Thread starter 3 months ago
#5
(Original post by mqb2766)
Shouldnt have needed trial and error, but its worth doing if you can't come up with another method.
Very true I kind of rearranged the equation a bit to find a value.
Last edited by Amelia_P; 3 months ago
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3 months ago
#6
(Original post by Amelia_P)
Very true I kind of rearranged the equation a bit to find a value.
Upload what youve done if you want. If you're happy with it, no problem.
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