It opens upward and the vertex is (2,-6) here are some plotted points: (0,6),(1,-3),(2,-6),(3,-3),(4,6). Hope that helps. I hate graphing but if you do it enough times you'll get the hang of it!
I’m not extremely good at math but I think you need to make -x-y=1 into y=mx+b form and then solve your new equation!
8x+6=62
8x=62-6
8x=56
X=56/8
X=7
The answer is 7. Hope this helps!