Answer:

Step-by-step explanation:
Given

Required
Determine x2, y2
Start by splitting the expression
and 
Solving for x2 in 
Multiply through by 2


Make x2 the subject;

Similarly:

Multiply through by 2


Make y2 the subject;

Hence:

One could use the relation

where

are two vectors,

denotes the norm of that vector, and

is the angle between the two vectors.
Then the two vectors will be parallel if

or

.
Whats the equation to the question
Answer: 45 degrees I think.
Step-by-step explanation: Based off of looks alone, one could conclude that 3x is approximately 0.5 degrees larger than 2x, 2x is approximately 90 degrees, and that x is approximately half of 2x. so based purely off of observation, it appears that x is approximately 45 degrees. you can multiply x by the number by in it in each instance.
x=45, 2x=90, and 3x=135
Please check if you have a protractor.