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The Vertical Line Test

YOUR TURN:

Which of these are functions?

a graph of an oval a graph of a horizontal line a graph of an upside-down standard parabola

 

Which of these are functions?  Draw rough sketches of the graphs so you can do the vertical line test:

y = -( 2 / 3 )x + 4
 

y = 5x - x^2

 

What about these?

a graph of an "m"-like curve   a graph of an oval