Given:
y is directly proportional to x.
when 
To find:
The equation that connects y with x.
Solution:
It is given that, y is directly proportional to x. So,
...(i)
Where, k is the constant of proportionality.
We have, when . Substituting these values in (i), we get
Divide both sides by 5.
Substituting 
in (i), we get
Therefore, the required equation is .
Answer:
I think it is A
Step-by-step explanation:
Yes. to find the area of a square when you know one side "s", you simply square that side since the area is equal to the base times the height, and the base and height will always be equal in a square since the sides are equal:
A = s^2
Represented in a function form:
f(s) = s^2
This means whatever you plug in for s, you will square it to get the area.
The answer is -20x, because the parentheses show they are being multiplied, so you multiply -10x and 2, which would be -20x.
1.5 × 10^(-4). .....this the scientific notation !
