Solve the Linear Equation: 2.6 - 3.8x = 10.2

Linear Equations with Decimal Coefficients

Solve for X.

2.63.8x=10.2 2.6-3.8x=10.2

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 We want to isolate the unknown X
00:07 Let's arrange the equation so that one side has only the unknown X
00:19 Let's simplify what we can
00:28 Let's isolate the unknown X and calculate
00:47 Let's simplify what we can
00:52 And this is the solution to the problem

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve for X.

2.63.8x=10.2 2.6-3.8x=10.2

2

Step-by-step solution

To solve the equation 2.63.8x=10.2 2.6 - 3.8x = 10.2 , we follow these steps:

  • Step 1: Move the constant term 2.6 2.6 to the right side of the equation.

Subtract 2.6 2.6 from both sides:
2.63.8x2.6=10.22.6 2.6 - 3.8x - 2.6 = 10.2 - 2.6

This simplifies to:
3.8x=7.6 -3.8x = 7.6

  • Step 2: Solve for x x by dividing both sides by 3.8-3.8.

Divide both sides by 3.8-3.8:
x=7.63.8 x = \frac{7.6}{-3.8}

Simplifying the right-hand side gives:
x=2 x = -2

Therefore, the solution to the equation is x=2 x = -2 .

Given the answer choices, the correct choice is 2-, which is equivalent to -2.

3

Final Answer

2-

Key Points to Remember

Essential concepts to master this topic
  • Isolation: Move constants away from variable term first
  • Technique: Subtract 2.6: get 3.8x=7.6 -3.8x = 7.6
  • Check: Substitute x = -2: 2.6 - 3.8(-2) = 10.2 ✓

Common Mistakes

Avoid these frequent errors
  • Adding instead of subtracting when moving terms
    Don't add 2.6 to both sides when 2.6 is already positive = wrong equation! This gives -3.8x = 12.8 and x = -3.37 instead of x = -2. Always do the opposite operation: if the term is +2.6, subtract 2.6 from both sides.

Practice Quiz

Test your knowledge with interactive questions

Solve for X:

\( x - 3 + 5 = 8 - 2 \)

FAQ

Everything you need to know about this question

Why do I subtract 2.6 from both sides instead of adding?

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Look at the equation: 2.63.8x=10.2 2.6 - 3.8x = 10.2 . The 2.6 is added to the left side, so to isolate the variable term, you need to do the opposite operation - subtract 2.6!

What if I get confused about positive and negative signs?

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Write each step clearly! When you subtract 2.6 from both sides: 2.62.63.8x=10.22.6 2.6 - 2.6 - 3.8x = 10.2 - 2.6 . The left side becomes 03.8x=3.8x 0 - 3.8x = -3.8x .

How do I divide by a negative number correctly?

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When dividing 3.8x=7.6 -3.8x = 7.6 by -3.8, remember: negative ÷ negative = positive! So 7.63.8=2 \frac{7.6}{-3.8} = -2 .

Why is the answer -2 but the choice shows '2-'?

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The choice '2-' is just another way to write -2. Some answer formats put the negative sign after the number, but they mean the same thing!

Can I check my answer a different way?

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Yes! Substitute x = -2 into the original equation: 2.63.8(2)=2.6+7.6=10.2 2.6 - 3.8(-2) = 2.6 + 7.6 = 10.2 ✓. Both sides equal 10.2, so the answer is correct!

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