Draw a perpendicular line to the x-axis that passes through the point (8,4)
1) Since a line is parallel then must have the same slope. In this case, there is no slope since x=-1 is a vertical line. But let's visualize it, the initial situation described by the problem:
2) Since it must be parallel to x=-1, our new line must be perpendicular to the x-axis and pass through x-coordinate, x=8. Since it must intercept point (8,4) Like this:
3) So to trace this line, we must draw a perpendicular line to the x-axis that passes through the point (8,4)