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It isn't. In fact, it's vital that you only do it when it's appropriate to do so. If a graph goes through the origin, that means the point (0,0) belongs on the line. In many cases it does, but in others it doesn't. Ask yourself what your graph means. Is one variable equal to zero when the other one is? Suppose you are plotting the temperature of a hot cup of tea, starting from the time you pour it. At time zero, the temperature will not be zero degrees celsius. It will be much higher. It is the same with mathematical graphs. y = x squared goes through the origin, but y = x squared + 1 does not.

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Q: Why is it important always to draw a line through the origin when you are making a graph?
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Related questions

Does the graph of an inverse variation pass through the origin?

Inverse variation does not pass through the origin, however direct variation always passes through the origin.


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Not always


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Not always. For example, try to find the slope of the line that passes through the points (3, 4) and (2, 3).


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yes, a graph of a direct variation must pass through the origin because direct variation is always in form of y=mx where x and y are variables and m is a constant.


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