Hi there!
Th' question asks :-
Which of the following lines is parallel to x = 4?
• 1ˢᵗ Option :-
=> y = 3 is [ Incorrect ]
• 2ⁿᵈ Option :-
=> y = 4 is [ Incorrect ]
• 3ʳᵈ Option :-
=> x = 2 is [ Correct ]
• 4ᵗʰ Option :-
=> x = y is [ Incorrect ]
EXPLANATION :-
→ Why 1ˢᵗ and 2ⁿᵈ Option are Wrong? :
X-axis and Y-axis are mutually perpendicular to each other.
Therefore, they can't be parallel.
→ Why 4ᵗʰ Option is Wrong? :
Th' value of X and Y is only same at the Origin ( 0, 0 )
Therefore, they can't be parallel.
→ Th' 3ʳᵈ Option is Correct, Cuz' X-axis is always parallel to itself.
In Short, x = 2 is th' Correct answer
~ Hope it helps!
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