2x-4y=20 what is the value of y

Answer:

Yes, the cost in dollars and the quantity of yogurt are indeed proportional.

The relationship can be expressed as:

Step-by-step explanation:

1. If varies directly with , it can be represented as:

Here, represents the constant of proportionality.

2. We'll calculate the proportionality constant. Given that and , we have:

3. Thus, the equation becomes:

4. Now, we need to verify proportionality. Substituting , which is the quantity of yogurt purchased by Jonah, we should arrive at $0.48:

5. They are indeed directly proportional.

The shape of the graph created by these data points indicates it correlates best with a quadratic function.

0.96/8= $0.12 (per crayon)
0.12x30= $3.60

 

 

 

 

The temperature change rate is determined by taking the temperature difference in °F and dividing it by the time measured in minutes. Thus,
rate of change in temperature = -25.5°F / 1.5 min
= -17°F / min
Therefore, the temperature decreases at a rate of -17°F every minute.