Oh, dude, let me break it down for you. So, like, a direct proportion means as one variable increases, the other also increases at a constant rate. And guess what? If you start at the origin (0,0) on a graph, that's like ground zero, where all the action begins. So yeah, a direct proportion totally passes through the origin on a graph. Cool, right?
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If it is a straight line through the origin then it represents a direct proportion.
If the variables x and y are in direct proportion then the graph of y against x is a straight line through the origin. If the variables x and y are in inverse proportion then the graph of y against x is a rectangular hyperbola. Alternatively, the graph of y against 1/x (or 1/y against x) is a straight line through the origin.
A straight line, through the origin, sloping up from left to right. The gradient of the graph will be the constant of proportionality.
hyperbola
The graph of the function y(x) = 1/x is a hyperbola.