A quantity that can have any one of a set of values or a symbol that represents such a quantity. A Coefficient is a number used to multiply a variable 4x means 4 times x so 4 is a coefficient Variables on their own without a number next to them actually have a coefficient of 1 x is really 1x. In the case of x 2 6 we can solve it to find that x 4.
But a variable that changes in direct response to the independent variable is the dependent variable.
In Mathematics if the answers seem to be not correct or theres no answer. But in something like y x 2 a linear equation x can have many values. An expression that can be assigned any of a set of values. In the expression 3a 8 3a and 8 are terms.