Question 841390
The slope is undefined; no vertical change, and because you want the x value to be -5, all values of y will be on the line you want.  The line is {{{highlight(x=-5)}}}.


You wanted in slope-intercept form, {{{y=mx+b}}}, but really, for the  line, having no restriction on y, the form you want may seem misleading:  {{{0=x+5}}}