I would say the answer is either c or a, can’t see the video so i can’t really determine
x = 4
A line with an undefined slope is a vertical line parallel to the y-axis and passing through all points with the same x-coordinate. For this reason it's equation is x = c where c is the value of the x-coordinate it passes through.
line passes through (4, 3 )
Hence equation is x = 4
Angle 6 - 30
Angle 5 - 73
Angle 1 - 37
Angle 2 - 52
Angle 4 - 63
Angle 3 - 128
What you are going to do is multiply what you have in parenthesis by two the answer is 2Xsquared and 2Y to the fourth
X=1119/2 hope this helps :)
