The sum of two numbers is 12. If one number is subtracted from the? other, the result is -4. Find the numbers.

Question

please explain how to derrive with the nswer toi this 

Answer 1

Hi Brent,

 

Let two numbers be x & y.

 

Sum of two numbers is 12 so we get eq,

 

x+y =12.......eq 1

 

one number is subtracted from other its -4, so we get eq,

 

x-y=-4........eq 2

adding eq 1 & eq 2, we get,

2x=8

x=4

substituting x=4 in eq 1, we get 4+y=12

                                                  y=8

 

so two numbers are 4 & 8.

 

check: LHS of eq 1=x+y = 4+8=12= RHS

           LHS of eq 2= x-y=4-8=-4= RHS.

so its verified ans.