Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
secondary 4 | A Maths
One Answer Below
Anyone can contribute an answer, even non-tutors.
Pls help as soon as possible
Date Posted: 4 years ago
Views: 423
y = xⁿ and y² = kx
when x = ½, y = 2,
2 = (½)ⁿ
2 = (2-¹)ⁿ
2¹ = 2-ⁿ
1 = -n
n = -1
And
2² = k(½)
4 = ½k
k = 8
when x = ½, y = 2,
2 = (½)ⁿ
2 = (2-¹)ⁿ
2¹ = 2-ⁿ
1 = -n
n = -1
And
2² = k(½)
4 = ½k
k = 8
So the graphs are :
① y = x-¹ = 1/x
② y² = 8x
x = ⅛ y²
For ① draw as usual.
For ②, it is similar to y = ⅛ x².
Instead of plotting y against x, turn the graph sideways and plot x against y.
① y = x-¹ = 1/x
② y² = 8x
x = ⅛ y²
For ① draw as usual.
For ②, it is similar to y = ⅛ x².
Instead of plotting y against x, turn the graph sideways and plot x against y.
Good evening Tarah! Looking at the two questions now.
See 1 Answer
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
Good evening Tarah! Here are my workings for both questions 2 and 3. Do note that the topic on proofs in plane geometry (question 3 falls under this topic) is no longer tested in this year’s variant of A Maths exams in the O Levels. Nevertheless, I have provided my workings for question 3 just in case you wish to learn more beyond what is tested in the O Levels for this year.
Date Posted:
4 years ago
What I told my students for the graph of y^2 = kx for k > 0 is this.
1. Rotate the writing paper 90 degrees to the left, so the paper looks tilted to the right with respect to the original viewing direction.
2. Sketch the graph of “y = x^2”.
3. Draw the axes from that view, but the arrow head for the “horizontal” is to be put at the left instead.
4. Rotate back the paper to the original view and label the y and x accordingly.
1. Rotate the writing paper 90 degrees to the left, so the paper looks tilted to the right with respect to the original viewing direction.
2. Sketch the graph of “y = x^2”.
3. Draw the axes from that view, but the arrow head for the “horizontal” is to be put at the left instead.
4. Rotate back the paper to the original view and label the y and x accordingly.
360 Tutoring Program