Question

1) y is inversely proportional to ( x + 2).

(a) write down an expression for y i terms of x and a constant k.

(b) it is given that y = 4 when x= 3

find y when x=8

add explanation

Answer 1

Answer:

According to given condition

y ~ 1/X+2

y=k/X+2

given values of y and X are

4=k/3+2

4=k/5

4×5=k

k=20

k is constant everywhere so

if X is 8 then y is

y= k/X+2

y= 20/8+2.

y= 20/10

y= 2