Chapter 8.1, Problem 64HP

To determine

Explain whether in a equation you have to add or subtract in a question of real − world situations.

Answer to Problem 64HP

It is useable because in a variable expression, it contains numbers, Operation and variables.

Explanation of Solution

Given:

It is given in the question that the there is a equation in which the used operation will be adding or subtracting.

Here, it has to be add or subtract the real world situations because a variable expression is a mathematical phrase that contains numbers, operations and variables. For example: $3x+y,10r-x$ .

Let’s take an example to understand the question:

Eden caught $14$ fish and then ate some. Write and expression to represent the number of fish Eden has left.

So, first decide on your variable. You don’t know how many fish Eden ate. Let x equals the number of fish Eden ate.

Next, write a variable expression using x , Eden started with $14$ fish, but then ate some. This means she will end up less fish than she started with. It has to be need to subtract the number of fish she ate from the number she started with. So, the expression is $14-x$ .