My Math Forum Can someone tell me if I'm correct on these problems please

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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? v-shape 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 x-axis 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 x-axis 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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