Question

select the pair of numbers that have a sum of 20 and a difference of 4

Answer 1

Answer:

x+y = 20 eq 1 ,x=20-y eq 2

x-y= 4

or 20-y-y = 4

or 20-2y= 4

or 20=4+2y

or 20-4=2y

or 16=2y,which means 16/2=y

or 8 =y which means Y=8

Using value of y in eq 2,

x=20-y,which means x= 20-8=12

x=12

Therefore, the two numbers are 12 and 8.