- If the equation is
:

- If the equation is
:

Hopefully the math was self-explanatory. If it is not, please feel free to ask for a step-by-step, in depth explanation, and I will edit my answer to accommodate.
Answer:

Step-by-step explanation:
Given formula:

To solve for 
In order to solve for
we will try to isolate
on one side of the equation.
Steps to isolate
.
1) Multiplying both sides by
to remove fractions.


2) Subtracting both sides by 


3) Subtracting both sides by 


Thus, we successfully isolated
on one side. The formula for
can be given as:
∴ 
The formula of a slope:

Δy = 2
Δx = 1
Substitute:

<h3>Answer: 2</h3><h3 />
Other method.
The formula of a slope:

Find two points.
(0, 1) and (1, 3). Substitute:

<h3>Answer: 2</h3>
Answer:
B. The statement is false. This is true only if θ is an acute angle in a right triangle.
Step-by-step explanation:
Trigonometric ratio formula can only be applied to define the relationship between the angles of a right triangle and its side lengths.
Therefore, it is impossible to define or find the tan θ of "any triangle". It only applies to right angled triangles.
In the case of a right triangle, given a reference angle, θ, tan θ = side lenght opposite to θ ÷ side lenght adjacent to θ (tan θ =
.
A right triangle has two acute angles and 1 right angle that which is 90°.
Therefore, we can conclude that:
"B. The statement is false. This is true only if θ is an acute angle in a right triangle."