- Write down what you know for sure:
5 times some expression which we will refer to as "unknown".
5 x (unknown)
2. The unknown is the sum of a number and 4
In this case, 'a number' is some variable which could be represented by x,y,z or any other letter.
For this problem, let's use the letter "z" to represent our variable.
"a number" = Z
This is then added or "summed" to the number 4.
Unknown = Z + 4
3. Combine your step 1 and step 2
Step 1 we discovered we have 5 x (unknown)
Step 2 we uncovered that unknown = Z + 4
Effectively, the algebraic expression is then,
5 x (Z + 4)