Question 1087361
Find the equation of line passing through (1,2) (1,-2)
<pre>As the x-coordinates repeat, or there're more than 1 y-values that're MAPPED to one (1) x-value,
the line has an UNDEFINED SLOPE, is vertical, is PARALLEL to the y-axis, and is therefore: {{{highlight_green(matrix(1,3, x, "=", 1))}}} 
That's it!! Nothing COMPLEX and/or CONFUSING!