The line parallel to y = x+4 has the form y = x + c, where "c" is some constant.
We find the value of "c" by substituting the coordinates of the given point (3,-1) into the equation
-1 = 3 + c,
which gives c = -1 - 3 = -4.
So, the equation of the requested line is
y = x -4. ANSWER
Solved and completed.
-------------------
There is a group of closely related lessons in this site