Final answer:
To find the value of x for which line a is parallel to line b, we need to set the angle of line b equal to x. The correct answer is 34°.
Step-by-step explanation:
The question asks for the value of x for which line a is parallel to line b. In order for two lines to be parallel, their slopes must be equal. The slope of a line is represented by the angle it makes with the x-axis. Therefore, we need to find the angle of line b and set it equal to x. The correct answer is 34°.