x - 4
The expression "x - 4" represents a simple algebraic equation where "x" is a variable. This means that "x" can take on different numerical values, and the expression calculates the result by subtracting 4 from whatever value "x" holds. For example, if "x" is 10, then "x - 4" equals 6.
In mathematics, this type of expression is often used in equations to solve for unknown values. It can also represent a linear function when graphed on a coordinate plane, where the line would have a slope of 1 and intersect the y-axis at -4, indicating the point where the function equals zero.