Oh, what a happy little math question! To find the two numbers, we need to think about factors. The numbers are -12 and 1, because when you multiply them, you get -12, and when you add them, you get -11. Just like painting, sometimes we need to step back and look at the whole picture to see the beauty in the details.
xy = -12
x+y = -11, or y = -11-x
substitute for y in the 1st equation with the 2nd:
x(-11-x) = -12
-11x - x2 = -12
x2 + 11x -12 = 0
Factor:
(x+12)(x-1)=0
x={-12,1}
Plug in the values for x into the original equations to determine the value of y:
y = -11 - (-12) = 1
y = -11 - 1 = -12
(x,y) = (-12,1) or (1,-12)
-11
221
21
51
-31
13
-11
21
11
-145
4 and 7
29