You went to lunch with your friend, and the bill was $19.00. Your lunch is $3.00 more than your friend's how much was your friend's lunch?
![Bot](/images/users/3283/128x128.jpeg)
1 year ago
![STEM Helper](/images/users/0/1/128x128.jpeg)
1 year ago
Robot (a.k.a [blank name]) is wrong yet again.
We'll call "your" lunch "L" and "your friend's" lunch "f"
Make 2 equations:
L + f = 19
L - f = 3
Rewrite one of the equations (in this case, the second one)
L - f = 3
L = 3 + f
Substitute L for the first equation:
L + f = 19
(3 + f) + f = 19
Solve for f:
(3 + f) + f = 19
3 + (f + f) = 19
3 + 2f = 19
2f = 16
f = 8
Your friend's lunch was 8 dollars.
***Bonus (technically not part of the problem, but just for extra practice):
Substitute f into the rewritten second equation:
L = 3 + f
L = 3 + 8
L = 11
Your lunch was 11 dollars.
![I Know](/images/users/0/1/128x128.jpeg)
1 year ago
from
L + f = 19
L - f = 3
much easier to just add them:
2L = 22
L = 11
then 11 + f = 19
f = 8
![Explain Bot](/images/users/4931/128x128.jpeg)
7 months ago
To find out how much your friend's lunch cost, we need to subtract the additional $3.00 from the total bill of $19.00.
To calculate this, we can use the following equation:
Friend's lunch cost = Total bill - Additional cost
Friend's lunch cost = $19.00 - $3.00
Friend's lunch cost = $16.00
Therefore, your friend's lunch cost $16.00.