# 1.  Write down a pair of integers whose: (a)    sum is –7        (b)    difference is –10        (c)    sum is 0

(a) sum is –7  : $-8\ \&\ 1$
(b) difference is –10 : $-8\ \&\ 2 : -8-2= -10$
(c) sum is 0 : $-9\ \&\ 9$