Solving for x: The Basics of Algebraic Equations

What is the value of x in the equation 5x = 45?

• A. 4
• B. 8
• C. 9
• D. 7

Answer: (C)

To find the value of x in the equation 5x = 45, we start by isolating x. This involves dividing both sides of the equation by 5. Doing this, we have: 5x / 5 = 45 / 5 This simplifies to: x = 9 Thus, the value of x is indeed 9. This tells us that when you multiply 5 by 9, you get back to 45, which verifies our solution. Therefore, the process of dividing both sides by the coefficient of x allows us to determine the value of x correctly and confirms that the answer is 9.

When it comes to mathematics, especially in a test as significant as the ACT Aspire, mastering the basics is your golden ticket! Let’s bounce into the world of algebraic equations with a straightforward example: What is the value of x in the equation 5x = 45? It may seem a bit daunting at first glance, but don’t worry—it's a simple problem that can teach you a lot about how to approach these types of questions.

You might recognize the options— A. 4, B. 8, C. 9, D. 7. To find the correct answer, we need to isolate x. This term might sound intimidating, but really, it just means we want to get x standing alone on one side of the equation. So, how do we do that? Well, let me explain! It’s just a matter of dividing both sides of the equation by 5.

So, we write it like this:

5x / 5 = 45 / 5

Seems pretty straightforward, right? That simplifies down to x = 9. There you have it! The value of x is indeed 9.

Now, let’s take a moment to think about why this works. When you take 5 and multiply it by 9, you return to 45. This verification is crucial because it ensures we’ve done everything correctly. You see, algebra isn’t just about numbers; it’s about logic and reasoning.

If you're preparing for a math exam like the ACT Aspire, it’s essential to grasp these concepts. Understanding the steps to isolate variables in an equation lays the groundwork for tackling more complex problems down the line. Think of it like building a house; you wouldn't start with the roof before laying the foundation, would you?

Now, perhaps you’re wondering: what if you get a question that looks even more complicated? Here’s the thing: the same principles apply! Just break it down into manageable steps. Focus on isolating the variable, and you'll be surprised how approachable even the toughest problems can become.

It’s also helpful to remember that practice makes perfect. Don’t shy away from working through similar problems. The more you engage with different equations, the more confident you’ll feel when a similar question pops up on your exam. For additional study resources, consider exploring online platforms that offer interactive problems or tutorials on linear equations—many can be surprisingly engaging and informative.

So, as you tackle your ACT Aspire preparation, keep that algebra magic in your arsenal. Mastering the basics gives you the freedom to explore more advanced concepts and expands your problem-solving toolkit. And always remember: each time you solve for x successfully, you’re not just answering a question; you’re building confidence for the bigger challenges ahead.