The other variable is doubled
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Direct proportion, linear, first-order... all of these are valid answers, depending on the particular field you're talking about.
Direct proportionality. Their graph would be a straight line through the origin, with the slope equal to the ratio.
direct proportion: y=kx inverse proportion: y=k/x
Two quantities x and y are said to be in direct proportion if whenever the value of x increase (or decrease), then the value of y increases (or decrease) in such a way that the ratio x/y remains constant.
If the points lie on a straight line through the origin, the two variables are in direct proportion.