New skill
x = the secret number
In algebra, a LETTER (usually x or y) stands for an unknown number. It's a placeholder until we figure out what it is. "x + 3 = 7" means: some number, plus 3, equals 7.
A letter like x can stand in for a number we don't know yet.
New skill
In algebra, a LETTER (usually x or y) stands for an unknown number. It's a placeholder until we figure out what it is. "x + 3 = 7" means: some number, plus 3, equals 7.