SOLUTION: so i am making sure of this. If y>0, does this mean all the y values of the graph must be greater than zero. Therefore , the graph must lies above the x-axis. Please tell me if thi

Algebra ->  Graphs -> SOLUTION: so i am making sure of this. If y>0, does this mean all the y values of the graph must be greater than zero. Therefore , the graph must lies above the x-axis. Please tell me if thi      Log On


   

Question 967779: so i am making sure of this. If y>0, does this mean all the y values of the graph must be greater than zero. Therefore , the graph must lies above the x-axis. Please tell me if this is correct or wrong?
Answer by josgarithmetic(39625) About Me  (Show Source):
You can put this solution on YOUR website!
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No. y%3E0 for some values of x; y=0 for other values of x; y%3C0 for still certain other values of x. Continuing to use y=x%5E2-2x%2B1 as an example, remember the critical x value found was x=1. y%3E0 almost everywhere except for at x=1. y%3C0 NOWHERE.