Question

write and linear equation represent a line which is parallel to y-axis and is at the distance of 2 units on the left side of x axis

Answer 1

Here is your answer
x= -2 is the required line

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Answer 2

line is parallel to y axis at a distance 'a' then equation is x= a

since your question says it lies on the negative x axis at a distance of 2

answer will be x=-2