My Math Forum Graphing Trig Equations

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 October 7th, 2009, 05:58 PM #1 Senior Member   Joined: Feb 2008 Posts: 100 Thanks: 0 Graphing Trig Equations I'm having a really hard time graphing a trig equation. I want to check my solutions for variable x, but since the equation is missing y I don't know how to set it up on my graphing calculator. If someone could help me on this, it will be of tremendous help. Ex: sin(3x)=(-1)
 October 7th, 2009, 06:25 PM #2 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,968 Thanks: 1152 Math Focus: Elementary mathematics and beyond Re: Graphing Trig Equations Assuming you want the values of x where sin(3x) = -1, use y = sin(3x) + 1 and then find the zeroes.
 October 7th, 2009, 06:29 PM #3 Senior Member   Joined: Aug 2008 From: Blacksburg VA USA Posts: 354 Thanks: 7 Math Focus: primes of course Re: Graphing Trig Equations ok, just set y=sin(3x)+1 and plot it over say y and x each over -4 to +4. You'll see the plot, but for your problem, y=0, so then you will be able to see the solutions where this is the case ...
 October 7th, 2009, 06:59 PM #4 Senior Member   Joined: Feb 2008 Posts: 100 Thanks: 0 Re: Graphing Trig Equations Thank you guys! I really appreciate it.

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