Answer
$(-3,0),(0,-3),(4,-7)$
Work Step by Step
To find the missing value, we plug in the value that we are given into the given equation and solve.
$(?,0)\\?+0=-3\\?=-3\\(-3,0)$
$(0,?)\\0+?=-3\\?=-3\\(0,-3)$
$(4,?)\\4+?=-3\\?=-7\\(4,-7)$