Question

The sum of two numbers is 170, and their difference is 110. Which is the greater of the two numbers?

Answer 1

x+y=170
x-y=110
2x=280
x=140 is an answer
y=30

Answer 2

Hello!

You can make two expressions based on what you know

x + y = 170
x - y = 110

You can add these expressions to eliminate y

2x = 280

Divide both sides by 2

x = 140

You can now put x into one of the original expression

140 + y = 170

Subtract 140 from both sides

y = 30

So the greater number is 140

Hope this helps!