Day 3: Quiz 3: Answers

 Quiz 3: Answers

Question 1: Write an equation to represent each method

Method 1: A flat fee of $7.00 per hour

              Answer: y = 7x

Method 2: An initial fee of $21.00 dollars plus $3.50 per hour

              Answer: y = 21x + 3.50

Question 2: How many hours must Charley do yardwork so that the money she earns from both methods is the same? 

Graph it :

As you can see, the point of intersection is 3 hours. You graph it by finding slope. Then putting it into y = mx+b form then you can graph it. 

The answer is 3 hours

Question 3: Ali is filling her fish tank. She starts with it 2 feet deep. It rises 4 inches per minute. 

a.) Explain how the equation y = 4x + 24 represents the filling of the tank.

Answer:  24 is what the tank is starting out in inches. 4x is the inches per minute.

b.) If the tank is 10 feet deep, when will it be full ?

Answer: 24 minutes .

equation :120 = 4x + 24
 1.) subtract 24 from each side .
       120 - 24 = 96
  new equation: 96 = 4x
2.) now divide 96 by 4.
 x=24