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September 18th, 2009, 06:36 PM  #1 
Newbie Joined: Sep 2009 Posts: 23 Thanks: 0  Can someone tell me if I'm correct on these problems please
1. The rectangular coordinate system is also known as the? Cartesian coordinate system 2.The graph of y=x+3 would form a? vshape 3. A function is a rule that assigns every number in the range (y) to one unique number in the domain (x). False 4.The graph of y=x+3 intersects the xaxis at what point? (3, 3) 5.Evaluate f(x)=x2+3x+4 for 2f(x). I don't know the answer to this 
September 18th, 2009, 06:49 PM  #2 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,929 Thanks: 1124 Math Focus: Elementary mathematics and beyond 
1. Correct. 2. Incorrect. y = x + 3 is a line. Try graphing it. 3. Correct. 4. Incorrect. The point is (3, 0). When a line intersects the xaxis y is equal to zero. 5. If f(x) = x^2 + 3x + 4 then 2f(x) = 2(x^2 + 3x + 4) = 2x^2 + 6x + 8. 
September 18th, 2009, 07:24 PM  #3 
Newbie Joined: Sep 2009 Posts: 23 Thanks: 0  Re: Can someone tell me if I'm correct on these problems please
thanks so much

September 18th, 2009, 07:29 PM  #4 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,929 Thanks: 1124 Math Focus: Elementary mathematics and beyond  Re: Can someone tell me if I'm correct on these problems please
You're welcome. Good luck with your studies.


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