## 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.

**Answer This Question**

Cannot solve pls help

&

X = 1/x

Y = mX + c

(i)

when y =1/6, x= 1,

Y = 6+1 = 7

X = 1

7 = m + c ... ... ... [1]

when y =1/2, x= 0.5,

Y = 2+2 = 4

X = 2

4 = 2m + c ... ... ... [2]

[2] - [1],

m = -3

c = 10

eqn is

Y = -3X + 10

=> 1/y + 1/x = -3/x +10

=> 1/y = -4/x + 10

(ii)

3/y + 3/x = 3

=> 1/y + 1/x = 1

=> Y = 1

=> X = (1-10)/-3 = 3

=> 1/x = 3

=> x = 1/3

(iii)

=> 1/y = -4/x + 10

=> x = -4y + 10xy

=> x = y(-4 + 10x)

=> y(10x-4) = x

=> y = x/(10x-4)

...

### See 1 Answer

*done*{{ upvoteCount }} Upvotes

*clear*{{ downvoteCount * -1 }} Downvotes