Question 250732
First put in in the form 
y=mx+b
so we have y=-x-7
Now it didn't ask for an ordered pair.
It asked for the y intercept.
You get the y intercept when x=0
-7 is the y intercept

It also asked you to graph the equation.
So you also want the x intercept when y=0
If y=0 then x=-7
I just so happens that the intercepts are (0,-7) and (-7,0)
Your point (-3,-4) is also on the line