Find the two numbers

Question

Find two numbers if their sum is -11 and their difference is 41

Answer 1

x+y =-11

x-y = 41 add the two equations to eliminate one variable

2x = 30

x = 30/2 = 15

y =-11-15 = -26

y=-26

x+y = 15-26 = -11

x-y = 15--26 = 15+26 = 41