Question

Suppose you receive an allowance of $107 and your friend receives an allowance of $83 at the beginning of the month. If you spend $8 a day and your friend spends $4 a day, after how many days will you and your friend have the same amount of money?

Answer 1

6 days
Y= 107-8x
Y=83-4x
You can use substitution
83-4X= 107-8x
Bring 8X
Over to the left
83+ 4x=107

Subtract 83
4x= 24
X=6
Or put in calculator and go 2nd graph you see table and on 6 day they both have $59