Question 904990
xy = -42  0r y = {{{-42/x}}}
x + y = -1
x + (-42/x) = -1  |Multiplying thru by x so as all denominators = 1
x^2 +x - 42 = 0
(x+7)(x-6) = 0
x is -7, 6
and 
y = 6, -7
Ordered pairs
(-7,6) or (6,-7) are solutions to this system of EQs