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.
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This requires that if one of x and y is 0, then so is the other, and that for every unit increase in x, y increase by k.
direct proportion: y=kx inverse proportion: y=k/x
Which type of line shows a direct proportion
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Direct Proportion-As one of the value increases,so does the other. Indirect Proportion-As one value increases,the other decreases. ~Hannah^^