Question

Write down a pair of integers whose:
(a) sum is -7
(b) difference is 0
​

Answer 1

$a + b = - 7 \\ a - b = 0 \\ 2a = - 7 \\ a = 7 \div 2$

Answer 2

Answer :

a) (-12) + 5

b) 7 - (-7)

Explanation :

a) (-12) + 5

$\rightarrowtail$ 12 - 5 = 7

$\rightarrowtail$ -12 + 5 = -7

$\:$

b) 7 - (-7)

$\rightarrowtail$ 7 + (additive inverse of 7) = 7 + (-7) = 0