what is the difference and similarities

if solving an equation with varibles in the equation if it had 1 or 2 or even 3 variables?

Here is one:

Money left in Wallet= money earned + money found - money lost - money spent.

I don't understand? can you please explain...

Cindy spends 20% of the money that she has on groceries.

She has a total of $30.

How much money did she spend on groceries?

20% of $30

=30 * 1/5
= $6

Certainly! In the equation you provided, "Money left in Wallet = money earned + money found - money lost - money spent," we can see that it involves variables related to money. Let's analyze the equation and see how it relates to solving equations with different numbers of variables.

When solving equations, the goal is to isolate the variable(s) and determine their values. In this case, we want to find the value of "Money left in Wallet."

To solve this equation with one variable, such as "x," we would need additional information or values for the other variables. If we have all the required information, we can calculate the value of "x" by substituting the known values and using algebraic operations to simplify the equation. For example, if we know the values for money earned, money found, money lost, and money spent, we can substitute those values into the equation and evaluate to find the value of "Money left in Wallet".

In the given equation, there are four variables: money earned, money found, money lost, and money spent. Having multiple variables can make the equation more complex to solve compared to having just one variable because we need to consider the relationship and contributions of each variable to the final result.

If we have two variables, such as "x" and "y," additional information is needed. For example, if we know the value of "x" or "y," we can substitute it into the equation to determine the other variable's value. By doing so, we can reduce the equation to one variable and follow the steps mentioned earlier to solve it.

Similarly, if we have three variables, such as "x," "y," and "z," we would need even more information or values to find the solution. With three variables, we usually require three independent equations to solve for the unknowns. These equations would contain different combinations of the variables, and by solving them simultaneously, we can find the values of the variables.

To summarize, the main difference when solving equations with one, two, or three variables is the amount of information needed or the number of equations required to find the solution. With one variable, additional values are needed. With two variables, the known value of one variable can help determine the other variable's value. And with three variables, we usually need three independent equations to solve for the different variables.