​ If the equation y = 3x 2 is changed to y = -3x 2, how will the graph of the line change?


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 If the equation y = 3x + 2 is changed to y = -3x + 2, how will the graph of the line change?

May 18th, 2015

If the equation y = 3x + 2 is changed to y = -3x + 2, the graph of the line will slope downwards as the value of x increases becuse the gradient has changed from positive to negative.

The gradient of y = 3x +2 is +3 while the gradient of y = -3x +2 is -3.

Note: 

If the slope of a line is positive, then the line slopes upward as the value of x increases and if the gradient  if the gradient negative, then the line  will slope downwards as the value of x increases.

May 18th, 2015

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