When the slope isn't defined, it's not possible to write the line in slope-intercept form. No slope means a vertical line, which here must be

The ordered pair (-1,6) obviously satisfies the above equation so is on the vertical line
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D 1/7 because only one chair is sort. Out of 7 only one person will have the short chair. 1/7 is the answer. trust me
So what i would do is take 3/5 and multiply is all by 3 so you end up with 9/15.
Now after you have done that do this, 9/15+ 4/15. Add 9/15 and 4/15 together which has a sum of 13/15 now add 11 + 6 which is 17 then add in the 13/15 and you get the answer of 17 13/15