Question 101364
Let x=one number
And y= the other number

Then
x+y=80-----------------eq1
x-y=18-------------------eq2

Add eq1 and eq2

2x=98  divide both sides by 2

x=49----------------one number
substitute x=49 into eq1

49+y=80  subtract 49 from both sides

y=80-49

y=31-----------------the other number

ck 49+31=80
80=80

and
49-31=18
18=18


Hope this helps----ptaylor