### CHECK OUT SHMOOP'S FREE STUDY TOOLS:

# Algebraic Expressions

# Variables as Unknown Quantities Exercises

### Example 1

For what value(s) of *x* does 5 + *x* = 10?

### Example 2

For what value(s) of y does (*y*)^{2} = 4?

### Example 3

For what value(s) of *z* is |*z*| < 5?

### Example 4

Write the following question in symbols:

"What number tripled equals fifteen?"