A pair of reading glasses shows you an image of an object that is 2.25 times the object's actual size. So the scale factor of th
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When we say that an amount of something increases as another amount increases, at the same rate, then we are talking about Direct Proportion. It is also true for an amount of something that decreases as another amount decreases, at the same rate. So "y varies directly as x" can be written as:
In other words:
Where k is the constant of proportionality, and represents the slope of a line that passes through the origin.
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