# Can you see what I have done wrong in this maths question

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Thread starter 4 months ago
#1
can you see what I have done wrong and if you know can you point me in the right direction.
Last edited by Maths Questions; 4 months ago
0
4 months ago
#2
What was your working/explanation?
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Thread starter 4 months ago
#3
(Original post by mqb2766)
What was your working/explanation?
I worked out the gradient of the radius which would be 4-0/-3/0 = -4/3
Then I found the negative reciprocal to work out tangent which is 3/4
I then found the equation of the tangent so:
-4=3/4(-3)+c
-4=-9/4+c
7/4=c
y = 3/4x+7/4
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4 months ago
#4
Y is 4, not -4 when working out c.
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Thread starter 4 months ago
#5
(Original post by mqb2766)
Y is 4, not -4 when working out c.
sorry, i meant to put 4. it would still get 7/4. it was just a typing error
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4 months ago
#6
(Original post by Maths Questions)
sorry, i meant to put 4. it would still get 7/4. it was just a typing error
How?
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Thread starter 4 months ago
#7
(Original post by mqb2766)
How?
I just realized what I have done wrong. Thanks for the help. I was meant to do 4--9/4 to get the answer.
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4 months ago
#8
(Original post by Maths Questions)
I just realized what I have done wrong. Thanks for the help. I was meant to do 4--9/4 to get the answer.
Yes. It's r^2/y = 5^2/4 = 25/4
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Thread starter 4 months ago
#9
(Original post by mqb2766)
Yes. It's r^2/y = 5^2/4 = 25/4
Bye. Thanks for the help
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