Question

Find two numbers whose sum is -2 and whose difference is 4

Answer 1

Let us assume the two numbers are x,y

x+y = -2

x-y = 4

solve it by elimination method,

add two equations

2x = 2

x = 1, substitute on first equations to get the value of y

y = -2 -2= -4

x = 2, y= -4