If a nurse has 20% alcohol solution and 70% alcohol solution, but needs 15 liters of a 40% alcohol solution, how do you think the nurse should proceed? Let’s use a system of linear equations and two different ways of solving this system of equations. First, we need to identify our variables, since we need to find out how much 20% alcohol solution (let’s call it Mixture A) and how much 70% alcohol solution (let’s call it Mixture B) we need.

Since our final mixture is a total of 15 liters, our first equation is A + B = 15.
Since our final mixture should have 40% alcohol solution, we need 6 liters of alcohol (.40*15) our second equation is 0.20A + 0.70B = 6.
Your job: Solve this system of equations for variables A and B by (1) graphing and by (2) either the substitution or substitution.

answer:

some responsibilities that come with having a checking account -

1. we have to maintain check register with exactness to avoid checks being returned for insufficient funds which is called bouncing a check.

2. we need to update our check register each time we make a transaction using a convenience card. updating check register will   save   us from   overdrawing of checking account.

3. read the agreement the bank gave you when you signed up for our checking account. this includes all the fees and the minimum balance we need to keep in our account to avoid maintenance charges.  

explanation:

note : -   checking account is a transactional deposit account. we can use it to deposit and withdraw funds. money in a checking account is very liquid. it   can be withdrawn using electronic debits, automated cash machines, or checks among other methods.