Solve the System of Equations: -2x + 3y = 14 and -4x + 6y = 28

Systems of Equations with Dependent Lines

Choose the correct answer for the following exercise:

{2x+3y=144x+6y=28 \begin{cases} -2x+3y=14 \\ -4x+6y=28 \end{cases}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve the system of equations
00:06 Multiply by 2 so we can isolate Y by subtraction
00:13 Now this is the system of equations
00:23 Subtract between the equations
00:32 Group like terms
00:40 According to this expression, X and Y are correct for any value
00:56 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

Choose the correct answer for the following exercise:

{2x+3y=144x+6y=28 \begin{cases} -2x+3y=14 \\ -4x+6y=28 \end{cases}

2

Step-by-step solution

To solve this system of equations, follow these steps:

  • Step 1: Simplify the second equation:
    The second equation is 4x+6y=28-4x + 6y = 28. By dividing every term by 2, we get:
    2x+3y=14-2x + 3y = 14.
  • Step 2: Compare the simplified second equation to the first equation:
    Both equations are now 2x+3y=14-2x + 3y = 14.

Since both equations are identical after simplification, this indicates that the system represents the same line.

Therefore, the system has infinite solutions because any point that satisfies one equation will satisfy the other.

Thus, the correct answer is Infinite solutions.

3

Final Answer

Infinite solutions

Key Points to Remember

Essential concepts to master this topic
  • Rule: When equations are identical, the system has infinite solutions
  • Technique: Simplify second equation: divide -4x + 6y = 28 by 2
  • Check: Both equations become -2x + 3y = 14, confirming dependency ✓

Common Mistakes

Avoid these frequent errors
  • Assuming different-looking equations always have one solution
    Don't rush to solve without simplifying first = missing the infinite solutions case! When equations look different but represent the same line, you need to recognize this special relationship. Always simplify both equations completely before determining the solution type.

Practice Quiz

Test your knowledge with interactive questions

Solve the following equations:

\( \begin{cases} 2x+y=9 \\ x=5 \end{cases} \)

FAQ

Everything you need to know about this question

How do I know when a system has infinite solutions?

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A system has infinite solutions when the equations represent the same line. After simplifying, if both equations are identical, every point on that line is a solution!

What's the difference between no solution and infinite solutions?

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No solution: parallel lines that never meet (like x + y = 5 and x + y = 3). Infinite solutions: the exact same line written in different ways.

Why do I need to simplify the second equation?

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Equations can look different but represent the same line! By dividing 4x+6y=28-4x + 6y = 28 by 2, we get 2x+3y=14-2x + 3y = 14, revealing they're identical.

Can I still find specific x and y values?

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With infinite solutions, you can pick any x-value and solve for y using the equation. For example: if x = 0, then 3y = 14, so y = 14/3.

How do I write the answer for infinite solutions?

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Write "Infinite solutions" or express the relationship as y=2x+143y = \frac{2x + 14}{3}. Both show that there are countless solution pairs!

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