Question

Write the equation of the line parallel to, and goes
through (2, -1).

Help?

Answer 1

As we know that

equation of line parallel to y-axis is x =. k

( 2, -1) lies on our required line.

2= k

k= 2

the equation of the required line is x=2.

Answer 2

Explanation:

General equation of line is y=mx+c where m is the slope

Slope of line parallel to x-axis is m=0

So y=(0)x+c⟹y=c

(2,-1) lies on our required line y=c

⟹−1=0(2)+c

⟹c=-1

Equation of the line is y=−1