###### Answer: y = mx or y = ax or y = kx. m a or k is just the coefficient in front of the x. They are also the SLOPE of the direct variation line. Direct variation lines have a y-intercept ot (0 0)
What is Direct Variation?

Direct variation definition is - mathematical relationship between two variables that can be expressed by an equation in which one variable is equal to a constant times the other.

Direct variation A direct variation also called direct proportion is a relationship between two variables x and y that can be written as y = kx k ≠ 0. This situation occurs when the ratio of two variables is constant. When y = kx we say that y varies directly with x. When z = kt we say that z varies directly with t.

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Direct Variation Direct variation describes a simple relationship between two variables . We say y varies directly with x (or as x in some textbooks) if: y = k x for some constant k called the constant of variation or constant of proportionality .

Direct Variation is said to be the relationship between two variables in which one is a constant multiple of the other. For example when one variable changes the other then they are said to be in proportion. If b is directly proportional to a the equation is of the form b = ka (where k is a constant).

When you have a direct variation we say...