Question 598052:  graph y= x^2 - 4 in a rectangular coordinate system  
 Answer by Alan3354(69443)      (Show Source): 
You can  put this solution on YOUR website! graph y= x^2 - 4 in a rectangular coordinate system  
---------- 
Pick values for x and find y 
Plot the points 
Draw a curve thru them 
----------- 
eg x = 0, y = -4 --> (0,-4) 
Notice that + and minus values of x give the same y, so you get 2 points. 
Do as many points as you need, or care to. 
 
  | 
 
  
 
 |   
 
 |