Your lunch and your friend Steve's lunch costs $19.00. Your lunch was $3.00 more than Steve's lunch. How much was Steve's lunch?

Question

Has to be written in an equation or inequality.

Answer 1

Let's call X my lunch and Y is Steve's lunch

 

X=Y+3 (Eq1)

X+Y=19 (Eq2)

 

Let's replace X by its value in Eq2:  Y+3+Y=19   Y=8

 

Let's replace Y by its value in Eq1: X=8+3=11

 

Answer: Steve's lunch was $8.00