Understanding Formulas: A formula is a mathematical equation that describes the relationship between two variables, such as $y = 2x + 3$.

Calculating Values with Formulas: By substituting known values into a formula, you can find corresponding values; for example, if $x = 2$ in $y = 2x + 3$, then $y = 7$.

Solving Real-Life Problems with Formulas: For example, $y = 20 + 12x$ represents the total savings over weeks, allowing you to determine the time needed to reach a savings goal.

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