# maths helpWatch

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#1
point c has coordinates (c, 2) and point d has coordinates (6, d). the line y 4x = 11 is the perpendicular bisector of CD. Find c and d.

I know the new line will have a gradient of 1/4, but other than that, I am really confused. Help please
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1 month ago
#2
Is this GCSE Level?
Last edited by NATHANSCARROTT; 1 month ago
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#3
yh, thank you, but as I said that was the one bit I knew haha y+ 4x = 11, so new gradient is 1/4
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#4
um early as maths
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#5
uhhh any ideas anyone please ?
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1 month ago
#6
(Original post by Klara_b155)
point c has coordinates (c, 2) and point d has coordinates (6, d). the line y 4x = 11 is the perpendicular bisector of CD. Find c and d.

I know the new line will have a gradient of 1/4, but other than that, I am really confused. Help please
One possible approach using early AS knowledge
1. Form an equation in c and d for the gradient between the two points that you know = 1/4
2. Work out the mid point in terms of c and d. You know this point lies on the given equation so substitute in to form a second equation in c and d
3 solve the simultaneous equations
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#7
thank you, i'll try that!
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1 month ago
#8
do you have the answers on you because i got c = -36 and d = 12.5 idk if im right tho
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1 month ago
#9
(Original post by Chaos6148)
do you have the answers on you because i got c = -36 and d = 12.5 idk if im right tho
Would the midpoint of those points satisfy the equation y+4x=11 ?
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