Question

if sun of two integers is -15,one of them is 8, so then the other is what?

Answer 1

X + y = -15
8 + y = -15
y = -15 - 8
= -23

Answer 2

Hey mate!!

Let the no. be x

$8 + x = - 15 \\ x = - 15 - 8 \\ x = - 23$
Hope it helps to you.