Two integers have a difference of -18 and a sum of 2. What is the product of the 2 integers?

Question

I don't know how to get it.

Answer 1

Two integers: m and n

m - n=-18

m+n=2

m=-8

n=10

 

Answer 2

x + y = 2

x - y = -18

2x = -16

x = -8

-8 + y = 2

y = 10