Real life s imultaneous equations problem solved by Elimination
7 pizzas and 5 chicken sandwiches cost $155. 10 pizzas and 8 chicken sandwiches cost $230. Find the cost of one pizza and one chicken sandwich. P= Pizza & S= chicken sandwich.
10p+ 8s= 230
Multiply to get similar variables:
8 X (7p+ 5s= 155) = 56p+ 40s = 1240
5 X(10p+8s= 230)= 50p + 40s = 1150
Since both s variables are positive we subtract the two equations.
56p + 40s = 1240
- 50p + 40s = 1150
6 = 90 = 15
Real life s imultaneous equations problem solved by substitution
Solve the following question
You are looking to rent an apartment. One costs $800 a month and has a $1000 deposit and the other costs $850 but has an $850 deposit. How long do you need to stay there before the first one is a better deal?