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y = -x-1 is an equation that defines y as a function of x. For each possible value of x, it tells us how to calculate the corresponding value of y. For example, when x is 3, y is -4. So the ordered pair (3, -4) belongs to the function. Similarly for other values of x. Some mathematicians define functions so that the ordered pair is the other way around, so that the above point would be written as (-4, 3). This is just an arbitrary notation convention. The important thing is to be consistent in whichever notation you use.

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12y ago

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