Solve the Equation: 2y(1/y) - y + 4 = 8y Step-by-Step

Linear Equations with Simplifying Fractional Terms

2y1yy+4=8y 2y\cdot\frac{1}{y}-y+4=8y

y=? y=\text{?}

❤️ Continue Your Math Journey!

We have hundreds of course questions with personalized recommendations + Account 100% premium

Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Let's reduce what we can
00:08 Collect terms
00:16 Isolate the unknown Y
00:32 Factor 6 into 2 and 3
00:36 Factor 9 into 3 and 3
00:45 Let's reduce what we can
00:51 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

2y1yy+4=8y 2y\cdot\frac{1}{y}-y+4=8y

y=? y=\text{?}

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Simplify the term 2y1y 2y \cdot \frac{1}{y}
  • Rearrange the equation to group similar terms
  • Solve for y y

Now, let's work through each step:

Step 1: Simplify the expression 2y1y 2y \cdot \frac{1}{y} .

The term 2y1y 2y \cdot \frac{1}{y} simplifies directly to 2 2 since y y in the numerator and denominator cancel each other out assuming y0 y \neq 0 . Therefore, the equation becomes:

2y+4=8y 2 - y + 4 = 8y

Step 2: Combine like terms on the left-hand side:

2+4=6 2 + 4 = 6 , so the equation now is 6y=8y 6 - y = 8y .

Step 3: Rearrange the equation to isolate y y on one side. Add y y to both sides to get rid of the negative y y :

6=8y+y 6 = 8y + y

This simplifies to:

6=9y 6 = 9y

Step 4: Solve for y y by dividing both sides by 9:

y=69 y = \frac{6}{9}

Simplify the fraction to get:

y=23 y = \frac{2}{3}

Therefore, the solution to the problem is 23 \frac{2}{3} .

3

Final Answer

23 \frac{2}{3}

Key Points to Remember

Essential concepts to master this topic
  • Simplification: 2y1y=2 2y \cdot \frac{1}{y} = 2 when y0 y \neq 0
  • Technique: Combine like terms: 2+4=6 2 + 4 = 6 , then 6y=8y 6 - y = 8y
  • Check: Substitute y=23 y = \frac{2}{3} : 223+4=823=163 2 - \frac{2}{3} + 4 = 8 \cdot \frac{2}{3} = \frac{16}{3}

Common Mistakes

Avoid these frequent errors
  • Forgetting to simplify the fractional term first
    Don't leave 2y1y 2y \cdot \frac{1}{y} as is = messy equation with fractions! This makes the problem unnecessarily complicated and leads to calculation errors. Always simplify 2y1y=2 2y \cdot \frac{1}{y} = 2 first before continuing.

Practice Quiz

Test your knowledge with interactive questions

\( x+7=14 \)

\( x=\text{?} \)

FAQ

Everything you need to know about this question

Why does 2y1y 2y \cdot \frac{1}{y} equal 2?

+

When you multiply a number by its reciprocal, they cancel out! Think of it as 2y×1y=2yy=2 2y \times \frac{1}{y} = \frac{2y}{y} = 2 . The y y 's cancel, leaving just 2.

What if y equals zero?

+

Great question! If y=0 y = 0 , then 1y \frac{1}{y} is undefined (you can't divide by zero). So we assume y0 y \neq 0 when simplifying.

How do I move all the y terms to one side?

+

Add y y to both sides! From 6y=8y 6 - y = 8y , adding y y gives 6=8y+y=9y 6 = 8y + y = 9y . This collects all y terms together.

Why is the answer a fraction?

+

Sometimes equations have fractional solutions - that's completely normal! y=23 y = \frac{2}{3} means y is two-thirds, which is between 0 and 1.

How can I check my work?

+

Substitute y=23 y = \frac{2}{3} back into the original equation. Calculate both sides: left side = 223+4=163 2 - \frac{2}{3} + 4 = \frac{16}{3} , right side = 8×23=163 8 \times \frac{2}{3} = \frac{16}{3} . They match!

🌟 Unlock Your Math Potential

Get unlimited access to all 18 Linear Equations (One Variable) questions, detailed video solutions, and personalized progress tracking.

📹

Unlimited Video Solutions

Step-by-step explanations for every problem

📊

Progress Analytics

Track your mastery across all topics

🚫

Ad-Free Learning

Focus on math without distractions

No credit card required • Cancel anytime

More Questions

Click on any question to see the complete solution with step-by-step explanations