Variables Math Example 3

Follow the full solution, then compare it with the other examples linked below.

Example 3

easy
If 2n=182n = 18, what is the value of nn?

Solution

  1. 1
    Divide both sides by 2: n=182=9n = \frac{18}{2} = 9.
  2. 2
    Check: 2(9)=182(9) = 18 ✓

Answer

n=9n = 9
The variable nn represents an unknown value. Dividing both sides by the coefficient isolates the variable.

About Variables

A symbol (usually a letter like xx) that represents an unknown or changing quantity in a mathematical expression.

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More Variables Examples

Example 1 easy

If [formula], what value does [formula] represent?

Example 2 medium

Evaluate the expression [formula] when [formula] and [formula].

Example 4 medium

Write an expression using a variable for: 'a number increased by 8.'

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