Question

the sum of two numbers is 55 and their differences is 7 . find the numbers

Answer 1

x+y = 55
y - x = 7
y= 7 + x
X+y = 55
X+7+x = 55
2x = 55 - 7
2x = 48
x = 24
y = 31

Answer 2

x + y=55
x - y =7
( -)(+) ( - )
--------------
2y=48
y=24
y=24 in x-y=7
x-24=7
x=24+7
x=31

x=31 and y=24