Solve Substitution Problem: Homework Equation v2=2v1

In summary, the conversation discusses a homework problem involving algebraic equations and fractions. The problem involves calculating the value of v1 and v2 using the given equations and solving for the missing variable. The final answer is 9.00km/h, but there was some confusion regarding the order of operations. It is suggested to practice and improve algebra skills in order to successfully solve similar problems in the future.
  • #1
henrbp29
2
0

Homework Statement



d1/d2 + d2/v2 = 0.500km/v1 + 3.50km/2v1 = 0.250h

Homework Equations



v2 = 2v1

The Attempt at a Solution



The answer is 9.00km/h but I keep coming up with 5.33. I know this is simple algebra but I am missing something in the order of operations.

0.500km/v1 + 3.50km/2v1 = 0.250h

4.00km/3v1 = 0.250h

4.00/(0.250h)(3) = v1

v1 = 5.33 ??
 
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  • #2
[tex]\frac{a}{b}+\frac{c}{d}\neq \frac{a+c}{b+d}[/tex]

At this point:
[tex]\frac{0.5 km}{v_1}+\frac{3.5 km}{2v_1}=0.25 hr[/tex]

Multiply both sides by [tex]v_1[/tex] and remember how to add fractions!

[tex]\frac{a}{b}+\frac{c}{d}= \frac{ad+bc}{bd}[/tex]
 
  • #3
Thanks again for your help! I'm new to the forum and still learning to navigate the site. I am taking an online physics course and will be needing your help in the future I'm sure. I'll be in touch.
 
  • #4
Sure thing man. :) But I suggest you work a bit on your algebra first, since you'll be using it a lot!
 

FAQ: Solve Substitution Problem: Homework Equation v2=2v1

What is a substitution problem?

A substitution problem is a type of mathematical problem where one variable is substituted for another in an equation. This is often used when solving systems of equations or when trying to isolate a specific variable.

How do you solve a substitution problem?

To solve a substitution problem, you first need to identify which variable you want to isolate. Then, you can rearrange the equation to solve for that variable. Next, you substitute the value of that variable into the original equation and solve for the remaining variable.

What are the steps for solving the equation v2=2v1?

Step 1: Identify which variable you want to isolate (in this case, v1).Step 2: Rearrange the equation to solve for v1 by dividing both sides by 2 (v1 = v2/2).Step 3: Substitute the value of v1 into the original equation (v2 = 2(v2/2)).Step 4: Simplify the equation (v2 = v2).Step 5: The solution is v2 = v2, meaning that v2 can take on any value.

Can substitution problems have more than two variables?

Yes, substitution problems can have more than two variables. The number of variables will depend on the number of equations given in the problem.

What are some real-life applications of solving substitution problems?

Solving substitution problems can be used in various fields such as physics, economics, and engineering. For example, in physics, substitution problems can help determine the relationship between different variables such as distance and time. In economics, substitution problems can be used to analyze the relationship between supply and demand. In engineering, substitution problems can help determine the optimal solution for a given system.

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