I believe there has to be an image included with this question my friend. Thine error hath been made known by the supreme lord of dao.
The equation would be 3l-5.
We have that the slope of the line containing the pair of points f(1) = -6 and f(-7) = -6. is

From the question we are told
Find the slope of the line containing the pair of points f(1) = -6 and f(-7) = -6.
Where Standard form of Equation is
y=mx+c
Generally the equation for the Slope is mathematically given as

Therefore

Therefore
The slope of this line is

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It looks like a slide because it looks to be shifted not flipped or changed in other way.
Answer:
The answer to your question is x = 3.356 cm
Step-by-step explanation:
This is a right triangle so we can use the Trigonometric functions to solve this problem.
Data
Ф = 40°
Adjacent side = 4 cm
Opposite side = x
Process
1.- We must know the lenght of the opposite side so we must use the tangent to solve it.
tangent Ф = 
2.- Solve it for Opposite side
Opposite side = tanФ x Adjacent side
Opposite side = tan 40° x 4
Opposite side = 0.839 x 4
Opposite side = 3.356
Opposite side = x = 3.356 cm