Question 103304: If we spend $15 for lunch and my friend spent $3 more than I did, what did I spend?
Answer by JP(22)   (Show Source):
You can put this solution on YOUR website! Your total spent is $15
Your friend spent $3 more than you, this is represented by 3+x.
You spent an unknown amount of money, this is represented by x.
So, your equation is 15=3+x+x.
This becomes 15=3+2x.
You then subtract 3 to the other side to get.
12=2x
Then divide 12 by 2, in order to isolate variable "x".
6=x is the amount you spent on lunch.
Your friend spent $3 more so add $3 to the amount you spent to get...
$9 spent by your friend.
You=$6
Friend=$9
Total=$15
To prove the solution is valid, plug 6 in for x.
15=3+2(6)
15=3+12
15=15 thus proving the solution is valid.
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