Opposite- 5/8
reciprocal- -8/5
absolute value- 5/8
She made an error in the STEP 1
she shouldnt multiply the numbers
Answer is
2
gradient=change in y/change in X
(10--2)/(4--2)=2
Given:
4:x::x:16
To find:
The value of x.
Solution:
We have,
4:x::x:16
It means, we have
4:x = x:16
It can be rewritten as

On cross multiplication, we get


Taking square root on both sides.


Since ratio can be negative or positive, therefore, the value of x is either -8 or 8.