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secondary 4 | A Maths
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kathy2
Kathy2

secondary 4 chevron_right A Maths chevron_right Singapore

Thank you

Date Posted: 4 months ago
Views: 22

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Eric Nicholas K
Eric Nicholas K's answer
3856 answers (Tutor Details)
1st
Here
kathy2
Kathy2
4 months ago
where u get 4x?
Eric Nicholas K
Eric Nicholas K
4 months ago
Wait let me check
Eric Nicholas K
Eric Nicholas K
4 months ago
Dy/dx represents the gradient, which is essentially m in the equation y = mx + c. Remember that tangents are straight lines. So does normals.
kathy2
Kathy2
4 months ago
I forget
Eric Nicholas K
Eric Nicholas K
4 months ago
So here the gradient of the tangent is 4 which means that the equation of the line is y = 4x + c
Eric Nicholas K
Eric Nicholas K
4 months ago
Normals are just lines which are perpendicular to tangents, so the normal has gradient -1/4 in this case, so the normal has equation y = -1/4 x + c.
kathy2
Kathy2
4 months ago
Sorry still confused
kathy2
Kathy2
4 months ago
Qns don’t have any 4
Eric Nicholas K
Eric Nicholas K
4 months ago
Ok I write up the entire thing once again with more explanations, wait
Eric Nicholas K
Eric Nicholas K
4 months ago
The 4 comes from the dy/dx value when x = 2. The terms m (in y = mx + c), gradient and dy/dx all mean the same thing.
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Eric Nicholas K
Eric Nicholas K's answer
3856 answers (Tutor Details)
This question is linked to your knowledge of coordinate geometry.