Question

Equation of a vertical line (-5,-1)

Answer 1

x=-5

Answer 2

Learn this...
HOY --- horizontal line, 0 slope, represented by y = a number
VUX --- vertical line, undefined slope, represented by x = a number

so if you are looking for a vertical line passing through (-5,-1), you would use the x term...so it would be x = -5

If you were looking for a horizontal line through (-5,-1), you would use the y term...and it would be y = -1