Question

Charlie says that y=2x^2 is not a function because the same y value sometimes corresponds to more than one x-value.
x -2 -1 0 1 2
y 8 2 0 2 8

Is Charlie correct? EXPLAIN PLZ BC I'M LOST

Answer 1

wrong.

it is not a function if the same x-value is related to more than one y-value.

Draw any graph. If a vertical line intersects the curve in more than one place, it is not a function.

Answer 2

thx Steve