Variables Math Example 2

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

Example 2

medium
Evaluate the expression 3x+2y3x + 2y when x=4x = 4 and y=−1y = -1.

Solution

  1. 1
    Substitute x=4x = 4 and y=−1y = -1 into the expression.
  2. 2
    Calculate: 3(4)+2(−1)=12+(−2)=103(4) + 2(-1) = 12 + (-2) = 10.
  3. 3
    The expression equals 10 for these values of the variables.

Answer

1010
Variables can take different values. By substituting specific numbers for each variable, we can compute the value of any algebraic expression.

About Variables

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

Learn more about Variables →

More Variables Examples

Example 1 easy

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

Example 3 easy

If [formula], what is the value of [formula]?

Example 4 medium

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

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