## How to Interpret Proportional Relationship Graphs

In the fascinating world of mathematics, understanding proportional relationships is integral. These relationships occur when two quantities vary in such a way that the ratio of their values is always constant. This can be represented with the equation $$y = kx$$, where $$k$$ is the constant of proportionality.

### Step 1: Identify the Proportional Relationship

First, we need to understand the problem and identify the proportional relationship. Suppose we're dealing with a scenario where we're traveling at a constant speed of 60 miles per hour. Here, the distance traveled is directly proportional to the time spent traveling.

### Step 2: Write the Proportional Equation

Next, we translate this proportional relationship into an equation. In our travel scenario, let's denote the distance traveled as $$d$$ and the time spent as $$t$$. The constant of proportionality is our speed, 60 miles per hour. So, we can write the equation as $$d = 60t$$.

### Step 3: Solve the Proportional Equation

Now, we can use this equation to solve problems. Suppose we want to find out how far we'd travel in 2 hours. We can substitute $$t = 2$$ into our equation to get $$d = 60 \times 2 = 120$$ miles.

### Step 4: Check Your Solution

Finally, it's always a good idea to check our solution. In this case, we can check that the distance traveled in 2 hours at a speed of 60 miles per hour is indeed 120 miles.

In conclusion, writing and solving equations involving proportional relationships is a fundamental skill in algebra. With practice, it becomes easier to identify these relationships and write and solve corresponding equations. Keep practicing and happy calculating!

### Example

Let's take an example where you are baking cookies and you know that for every batch of cookies you bake, you need 2 eggs. This is a proportional relationship, where the number of batches $$b$$ is proportional to the number of eggs $$e$$ needed. The constant of proportionality is 2.

### Step 1: Identify the Proportional Relationship

In this scenario, the relationship is between the number of batches of cookies and the number of eggs needed. It is given that 2 eggs are needed for each batch.

### Step 2: Write the Proportional Equation

We can denote the number of batches as 'b' and the number of eggs as 'e'. The constant of proportionality is 2, so we write the equation as $$e = 2b$$.

### Step 3: Solve the Proportional Equation

Now suppose you want to bake 5 batches of cookies and need to know how many eggs you'll need. Substitute $$b = 5$$ into the equation to find out: $$e = 2 \times 5 = 10$$. So you'll need 10 eggs to bake 5 batches of cookies.

### Step 4: Check Your Solution

The solution can be checked by confirming that if you use 10 eggs, you can indeed bake 5 batches of cookies, given the original requirement of 2 eggs per batch.

Understanding the steps to write and solve equations using proportional relationships can make problem-solving easier and help in various real-life scenarios like this one.

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