Calculate $\left. \frac { \partial f } { \partial x } \right| _ { ( 8,7 ) }$

Short Answer

Calculate $\left. \frac { \partial f } { \partial x } \right| _ { ( 8,7 ) }$ , and $\left. \frac { \partial f } { \partial y } \right| _ { ( 8,7 ) }$ when defined.
​ $f ( x , y ) = 1,120 - 17 x + 19 y + 3 x y$ ​
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