5/27/22, 3:24 AM Simplifiying Expressions with Variables
The Order of Operations and Variables:
Simplifying Expressions with Variables
If we have an equation (or expression) with variables, we can only solve what it is equal to when
we know what the variables are. The following video will show how to solve an equation when
given numbers for the variables.
0::13 1x
Video Source (04:13 mins) | Transcript
Simplifying expressions with variables comes in handy a lot when we are given a formula for a
certain type of problem. A formula is something that looks like pt = a. This is a formula for finding
the amount when we know the percent and the total. We learned about this formula in last
week’s lesson on percentages. In this case, p represents the percent and t represents the total.
If we were told that the percent was 75% and the total was 20, we could find that the amount
was 15. This is done by putting our values in for our variables in the formula. pt becomes
(.75)(20).
Additional Resources
Khan Academy: Variables, Expressions, & Equations (06:54 mins, Transcript)
Khan Academy: Evaluating an expression with one variable (01:59 mins, Transcript)
Practice Problems
Simplify the following expression to find it's value:
1. Given that d = 3:
https://content.byui.edu/file/b8b83119-9acc-4a7b-bc84-efacf9043998/1/Math-1-6-4.html 1/2
The Order of Operations and Variables:
Simplifying Expressions with Variables
If we have an equation (or expression) with variables, we can only solve what it is equal to when
we know what the variables are. The following video will show how to solve an equation when
given numbers for the variables.
0::13 1x
Video Source (04:13 mins) | Transcript
Simplifying expressions with variables comes in handy a lot when we are given a formula for a
certain type of problem. A formula is something that looks like pt = a. This is a formula for finding
the amount when we know the percent and the total. We learned about this formula in last
week’s lesson on percentages. In this case, p represents the percent and t represents the total.
If we were told that the percent was 75% and the total was 20, we could find that the amount
was 15. This is done by putting our values in for our variables in the formula. pt becomes
(.75)(20).
Additional Resources
Khan Academy: Variables, Expressions, & Equations (06:54 mins, Transcript)
Khan Academy: Evaluating an expression with one variable (01:59 mins, Transcript)
Practice Problems
Simplify the following expression to find it's value:
1. Given that d = 3:
https://content.byui.edu/file/b8b83119-9acc-4a7b-bc84-efacf9043998/1/Math-1-6-4.html 1/2
