The sum of two numbers is -9 and their difference is 31. What are the numbers?

Question

•  The question is a problem solving one.
• I can't really tell you much because the question is really short. Thank you and bye!

Answer 1

Let x = the larger number

Let y = the smaller number

x + y = -9

x - y = 31

2x = 22

x = 11

x + y = -9

11 + y = -9

y = -20

 

 

Answer 2

x+y=-9

x-y=31

add

2x=22

x=11

y=-9-11

y=-20

11 and -20

11+(-20)=-9

11-(-20)=11+20=31