A direct variation is a situation in which two quantities -- such as hours and pay, or distance and time -- increase or decrease at the same rate. The ratio between the quantities is constant; that is, as one quantity doubles, the other quantity also doubles. so yes it is.
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A direct variation is in the form y=ax where a is an constant.
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No.
Direct
YES...A direct variation is a linear relationship in which y-intercept is always 0.
k is the constant of variation and is the gradient (slope) of the relevant graph.
Any function of the form Y = cX where X and Y are variables and c is a constant.