Answer:
x = 1.2 if that is really a decimal point.
x = 1 if there is a comma between 1 and 2
Explanation:
An undefined slope means that the graph of the line is vertical.
If there is a comma, the first number is the x value. the second is the y value.
If the line is vertical, it passes through all possible y values. so (1,2) is on that line, also (1,3) , (1,0), (1,100000) etc.
The graphs attached are of x = 1.2 and of an undefined slope passing through point (1,2)
I hope this helps!