What does y=2 means?

What does y=2 means?

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You might be refering to the graph of a line whose equation is y = 2. It's just a line parallel to the x axis that intercepts the y axis at the point (0, 2). Every point on the line has a y coordinate value of "2," no matter what its x coordinate value is.

it means that the letter y is equivalent or equal than the number 2