Question

how line x+1=0 is parallel to y axis
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Answer 1

x+1=0

x=_1

for any value of y ,x has a fixed value so graph will be a straight line // to y axis ....

Answer 2

Thus, if P(x, y) is any point on AB, then x = a. Hence, the equation of a straight line parallel to y-axis at a distance a from it is x = a. The equation of y-axis is x = 0, since, y-axis is a parallel to itself at a distance 0 from it.