The vertical line test shows how many outputs (y-value) there are for one input (x-value). There can only one output for each input because only one value should satisfy an equation that represents a function. If the vertical line goes through the graph twice, that shows there are two outputs for a single x-value. This would mean it is not a function.
Ee a solution process below: Explanation: The point-slope formula states: ( y − y 1 ) = m ( x − x 1 ) Where m is the slope and ( x 1 y 1 ) is a point the line passes through. Substituting the slope and values from the point in the problem gives: ( y − − 1 ) = − 3 ( x − 2 ) ( y + 1 ) = − 3 ( x − 2 )
