Divide 27 and 3. then divide 31 and 4. you get 9 and 7.75. subtract those. you get 1.25
Using the Pythagorean identity, the value of the cosine ratio is 
<h3>How to determine the cosine ratio?</h3>
The given parameter is:

By the Pythagorean identity, we have:

So, we have:

This gives

Evaluate

Take LCM

This gives

Take the square root of both sides

Cosine is positive in the fourth quadrant.
So, we have:

Hence, the cosine value is 
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Answer:
y = - 3x - 2
Step-by-step explanation:
The equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y- intercept )
Here m = - 3, thus
y = - 3x + c ← is the partial equation
To find c substitute (1, - 5) into the partial equation
- 5 = - 3 + c ⇒ c = - 5 + 3 = - 2
y = - 3x - 2 ← equation of line
X2(squared)x7(squared)x to the power of 9
Hope this helps