Answer:
x = 12
Step-by-step explanation:
This is a supplementary angle so the right side is equal to 90°. This means the other side must also equal 90°
So subtract 20° from 90° and you get 70°
Next you can just (6(12)-2) or continuously substitute until you get the right answer.
The point-slope form:

m - slope
(x₁, y₁) - point
The formula of a slope:

We have the points (-3, 7) and (9, -1). Substitute:

<em>point-slope form</em>
<em>slope-intercept form</em>
<em>standard form</em>
This question is not clear. I advised posting it in better terms.