Use the Fundamental Identities to Find the Value of the Trigonometric

Multiple Choice

Use the fundamental identities to find the value of the trigonometric function.
- $- 8 x - 5 y = 0 , x \geq 0 ; \quad$ Find $\cos \theta$

A) $\frac { 5 \sqrt { 89 } } { 89 }$
B) $- \frac { 5 } { 8 }$
C) $- \frac { 8 } { 5 }$
D) $\frac { \sqrt { 89 } } { 5 }$