# Determine values

• Jan 26th 2009, 07:09 PM
HelpMath
Determine values
Dear all,

Would appreciate some guidance for this question:

If q = ax + by and r = bx - ay, determine the value of:
Attachment 9878

Thank you.
• Jan 27th 2009, 12:30 AM
Showcase_22
If $q=ax+by$ then would $\frac{dq}{dx}=a$ so $\frac{dq}{dx}\frac{1}{y}=\frac{1}{y}$?

Is b also a constant?
• Jan 27th 2009, 12:42 AM
HelpMath
Had edited the equation above in image format for better viewing.
Thank you...