Respuesta :

irspow
They tell you that the relationship is y is the product of x and 2.  Product means the result of multiplication.

y=2x

And this is a function as each input value, x, has one unique output value, y.)

For output values you will get 2 times the input values. So for x={-2,-1,0,1} you get:

y={-4,-2,0,2}
camkeat
Using the first answer, you can determine it is a function if it crosses the X axis

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