How Do You Know If the Graph is a Function? A function always passes the vertical line test . To use this test, just take a vertical line (or just a vertical stick) and make it pass through the graph from left to right horizontally.
And sometimes there's something called the vertical line test that tells you whether something is a function. When it's graphically defined like this, you literally say, OK, when x is 4, if I draw a vertical line, do I
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math is the study of numbers, shapes, and patterns. It is used in everyday life, from counting to measuring to more complex calculations.