Question

Find two numbers, if …
Their sum is 3 and their difference is 21
PLZ

Answer 1

x+y=3
x-y=21

x=3-y

3-y-y=21
-2y+3=21
-2y=18
y=-9

x = 3-(-9) = 12

Two numbers are 12 and -9.

Hope this helps.