Question 1155115
What is the distance between (-3,5) and (-12,5)?
<pre>Same y-coordinate indicates a 0 (zero) slope. 
Therefore, you just need to SUBTRACT the SMALLER x-coordinate from the LARGER x-coordinate, thereby getting: {{{highlight_green(matrix(1,6, - 3 - - 12, "=", - 3 + 12, "=", 9, units))}}}
That's ALL!!