1.2: Replacing Variables with Their Values
We often know the value of a variable for a given problem. For the example given at the start of the chapter, we said that if you make $10 per hour and you work h hours, your pay would be $10 × h. Let's say you worked 40 hours in a given week. For that week, we say h = 40. So, your pay would be $10 × 40 = $400.
Being able to substitute a value in for a variable appropriately is an important skill in algebra. You also need to understand how to write variable expressions when multiplication is involved.
Watch this video, which highlights some common ways to write multiplication in algebra. It also shows examples of how to substitute values in algebraic expressions.
After you watch, complete these assessments that involve substituting values into algebraic expressions with variables. If you need help, use the review tools at the bottom of the page.
Continue with this second set of assessments. If you need help, use the review tools at the bottom of the page.