Key Terms Review

Do you still remember what a variable is? What about an expression? Well, here's your chance to review.

A VARIABLE is a letter that represents an unknown number.

For example, x, y, n are usually represented for an unknown number.

An EXPRESSION is any single number(3) or variable(x) or combination of operation(+) involving numbers and a variable.

For example, 2y-7.

The VALUE is a known or calculated amount.

For example, 3 is a known or calculated amount.

A CONSTANT is a number that does not change, but it increases or decreases the value of an expression.

For example, 3x+5. 5 is the constant.

A NUMERICAL COEFFICIENT is a number that multiplies the variable.

For example, 10x⁴ . The numerical coefficient is 10.

Do you understand now? I sure hope you do.

If you still don't, try this link:

http://www.icoachmath.com/math_dictionary/mathdictionarymain.html