Step-by-step explanation:
It's the equation of a line.
We need only two points to the plotting a graph of a line.
y = -x - 3
for x = -3
y = -(-3) - 3 = 3 - 3 = 0 → (-3, 0)
for x = 0
y = -0 - 3 = 0 - 3 = -3 → (0, -3)
