Question

The difference between two numbers is 18 if there sum is 86 what are the numbers

Answer 1

x-y=18
x+y=86
2x=104. .......by doing algebraic addition
x=52
put the value of x in above equation
52-y=18
y=52-18
=34

Answer 2

x-y=18
x+y=86... Addition of algebraic expressions
2x=104
x=52
put the value of x to find y
52-y=18
52-18=y
34=y