Calculate $\left. \frac { \partial f } { \partial x } \right| _ { ( 4,5 ) }$

question 136

Multiple Choice

Calculate $\left. \frac { \partial f } { \partial x } \right| _ { ( 4,5 ) }$ , and $\left. \frac { \partial f } { \partial y } \right| _ { ( 4,5 ) }$ when defined. $f ( x , y ) = 960 - 13 x + 6 y + 7 x y$

• A) \(\left. \frac { \partial f } { \partial x } \right| _ { ( 4,5 ) } = - 22\) , \(\left. \frac { \partial f } { \partial y } \right| _ { ( 4,5 ) } = - 34\)
• B) \(\left. \frac { \partial f } { \partial x } \right| _ { ( 4,5 ) } = 110\) , \(\left. \frac { \partial f } { \partial y } \right| _ { ( 4,5 ) } = 136\)
• C) \(\left. \frac { \partial f } { \partial x } \right| _ { ( 4,5 ) } = 28\) , \(\left. \frac { \partial f } { \partial y } \right| _ { ( 4,5 ) } = 5\)
• D) \(\left. \frac { \partial f } { \partial x } \right| _ { ( 4,5 ) } = 22\) , \(\left. \frac { \partial f } { \partial y } \right| _ { ( 4,5 ) } = 34\)
• E) \(\left. \frac { \partial f } { \partial x } \right| _ { ( 4,5 ) } = 34\) , \(\left. \frac { \partial f } { \partial y } \right| _ { ( 4,5 ) } = 22\)