My Math Forum Determine value of X and Y

 Calculus Calculus Math Forum

January 25th, 2009, 07:15 PM   #1
Newbie

Joined: Jan 2009

Posts: 19
Thanks: 0

Determine value of X and Y

Dear all,

Would appreciate some guidance for this question:

If q = ax + by and r = bx - ay, determine the value of:
[attachment=0:2v3b4rrt]equation.JPG[/attachment:2v3b4rrt]

Thank you.
Attached Images
 equation.JPG (2.4 KB, 128 views)

 January 29th, 2009, 06:43 AM #2 Newbie   Joined: Jan 2009 Posts: 4 Thanks: 0 Re: Determine value of X and Y I think you should clarify your expression, what do your symbols mean?
 January 29th, 2009, 03:36 PM #3 Newbie   Joined: Jan 2009 Posts: 19 Thanks: 0 Re: Determine value of X and Y the question wants me to differentiate dq/dx with y treated as a constant and dx/dq with r treated as a constant.
 January 31st, 2009, 09:30 AM #4 Global Moderator   Joined: Dec 2006 Posts: 20,968 Thanks: 2217 If a, b and y are constant, differentiating the first equation gives dq/dx = a. If a, b and r are constant, dr/dx = 0, so differentiation the second equation gives 0 = b - a dy/dx, and so dy/dx = b/a. Also, differentiating the first equation gives dq/dx = a + b dy/dx, so dq/dx = a + (b^2)/a, and so dx/dq = a/(a^2 + b^2). This assumes that a and b are not both zero, which would mean that q was zero and dx/dq undefined.

 Tags determine

,

,

,

### determine the value of x and y

Click on a term to search for related topics.
 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post joeljacks Calculus 7 November 18th, 2012 09:11 PM pjlloyd100 Calculus 2 October 1st, 2012 10:27 PM joker91 Algebra 1 May 24th, 2012 11:19 AM wannous Calculus 2 November 3rd, 2009 07:46 AM watuwanz Calculus 1 March 22nd, 2009 07:50 AM

 Contact - Home - Forums - Cryptocurrency Forum - Top