Question

What is the parallel to the line x=15 and contains the point (-1,5)

Answer 1

The line x=15 is the line parallel to the axis OY.
So the paralel lines to the line x=15 are parallel to the axis OY, so their equations are x=a, where "a" is a real number.
Here you've got point (-1,5) so x-coordinate is x=-1,
So equation this line is x=-1
....

Answer 2

`Look\ at\ the\ picture.\\\\x=-1\ is\ parallel\ to\ the\ x=15\ and\ contains\ the\ point\ (-1;\ 5)`