Question

Two numbers have a difference of 0.7 and a sum of 1 what are the numbers

Answer 1

{x+y = 1
{x-y = 0.7
add both equations
2x = 1.7
x = 0.85

x+y = 1
y = 1-x
y = 1-0.85
y = 0.15

Answer 2

0.85 and 0.15

0.85 - 0.15 = 0.70
0.85 + 0.15 = 1

0.85 and 0.15 is your answer

hope this helps