Equations Math Example 3

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

Example 3

easy
Solve x+9=15x + 9 = 15.

Solution

  1. 1
    Subtract 9 from both sides: x=15−9=6x = 15 - 9 = 6.
  2. 2
    Check: 6+9=156 + 9 = 15 ✓

Answer

x=6x = 6
Undo addition by subtracting the same value from both sides.

About Equations

A mathematical statement that two expressions are equal, connected by an equals sign (==). Equations assert a relationship between quantities and can be solved to find the values of unknown variables that make the statement true.

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More Equations Examples

Example 1 easy

Is [formula] a solution of [formula]?

Example 2 medium

Solve [formula].

Example 4 hard

Which of these is an equation and which is an expression? (a) [formula] (b) [formula]

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