A multi-step equation is an equation that requires more than one step to solve. It often involves combining like terms, using the distributive property, and isolating the variable.

You can represent a savings problem with an equation by identifying the initial amount, the rate of saving, and the total amount saved. For example, if Bob has $150 and saves $40 per month, the equation is: Total = Initial + (Rate * Months).

In word problems, 'x' usually represents an unknown quantity that you need to solve for, such as the number of months or weeks.

To set up an equation for a problem with a fixed fee and a variable cost, add the fixed fee to the product of the variable cost per unit and the number of units. For example, Total Cost = Fixed Fee + (Variable Cost per Unit * Number of Units).

The first step in solving a multi-step equation is to simplify both sides of the equation if possible, which may include combining like terms or distributing.

To find the total cost of renting a car, use the formula: Total Cost = Daily Fee + (Cost per Mile * Number of Miles).

Identifying the unknown in a word problem is crucial because it helps you determine what variable to solve for and guides you in setting up the equation.