Explanation:
you need to calculate coordinates first. just by having the function definitions you don't have any coordinates yet.
I typically pick x = 0 as a first point.
so, that gives
-2×0 - 5 = -5
as y result for the first line.
the point on line 1 is then (0, -5)
and we get -0 - 4 = -4 as y result for the second line.
the point for the second line is (0, -4)
for second points I typically go for x = 1.
for the first line we get
-2×1 - 5 = -2 - 5 = -7
and the second point is (1, -7) for the first line.
for the second line we get
-1 - 4 = -5
and the second point is (1, -5) for the second line.
so, make points on the chart for all 4 points, and connect them (and extend the connecting lines to the left and right to the end of the grid).
and the crossing point ?
that is where both equations deliver the same result.
so,
-2x - 5 = -x - 4
-x = 1
x = -1
and the y is then e.g. -2×-1 - 5 = 2 - 5 = -3
and the crossing point is (-1, -3)