Question

How do variables help you model real-world situations? Give an example of a model that uses variables and explain how it helps people make predictions.

Answer 1

In real world variables can be used to represent variable quantities in situations and in patterns.
Example: fishing. When we are fishing and we catch a fish, the fish can be represented with a variable.  It is particular fish, and we know some facts (the fish swims, it has gills, its size) , but we do not know other details about the fish (exactly which type of fish it is).

Answer 2

River Cauvery in India is drying up.So, to make Cauvery alive again ,Trees are planted, for that fund is required by an Organisation who is working on this project.Now, total amount of fund required for planting trees is $x.Now, Thousand Business Person's has decided that we will participate in this fundraising Program and they will share Equal amount of Money.And each Business Person Donated $ y.

Solution:

 Here ,we have used two variables x, and y.

Where, x=Total Amount Required for Planting Trees

And, y=Amount Donated by each of thousand Business Person

    So, if you write this statement in terms of equation, it will be

  ⇒x-1000y=0