Find the two numbers

Question

Find two numbers if their sum is 3/5 , and their difference is 7 1/5

Answer 1

x+y = 3/5

x-y = 7 1/5 = 36/5 add the two equations to eliminate one variable

2x = 39/5

x = 39/10 = 3.9

y = 3/5 -39/10 = 6/10 - 39/10 = -33/10 = -3.3

x = 39/10 = 3.9, y = -33/10 = - 3.3

39/10 - - 33/10 = 72/10 = 7 2/10 = 7 1/5

39/10 + -33/10 = 6/10 = 3/5