What is the domain of the function expressed by this formula? Y= 1/x - 7
1 answer:
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Answer:
x = 17 $20 bills
y = 30 $5 bills
General Formulas and Concepts:
- Order of Operations: BPEMDAS
- Multivariable Systems
Step-by-step explanation:
<u>Step 1: Define variables</u>
x = # of $20 bills
y = # of $5 bills
<u>Step 2: Set up systems of equations</u>
<u /><u />
<u />
<u>Step 3: Solve for </u><em><u>x</u></em>
- Rewrite:
- Substitute:
- Distribute 5:
- Combine like terms:
- Subtract 235 on both sides:
- Divide both sides by 15:
By solving for <em>x</em>, we now know that we have 17 $20 bills.
<u>Step 4: Solve for </u><em><u>y</u></em>
- Define: x + y = 47
- Substitute: 17 + y = 47
- Subtract 17 on both sides: y = 30
Now we know that we have 30 $5 bills.