Solve for X and Y: Exploring the System -8x + 5y = 2, -16x + 10y = 5

Choose the correct answer for the following exercise:

{8x+5y=216x+10y=5 \begin{cases} -8x+5y=2 \\ -16x+10y=5 \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
00:03 Multiply by 2 so that we can isolate Y by subtraction
00:17 Now this is the system of equations
00:27 Subtract between the equations
00:45 Collect like terms
00:55 We got an illogical expression, therefore there is no solution
01:00 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:

{8x+5y=216x+10y=5 \begin{cases} -8x+5y=2 \\ -16x+10y=5 \end{cases}

2

Step-by-step solution

To solve this system of equations, we'll follow these steps:

  • Step 1: Analyze the proportions of the coefficients to check for potential parallelism or redundancy.
  • Step 2: Attempt elimination to directly identify any inconsistencies.

Now, let's perform the analysis:
Step 1: Notice the proportionality in both equations:
The first equation is 8x+5y=2-8x + 5y = 2 and the second is 16x+10y=5-16x + 10y = 5. Multiply the first equation by 2:
16x+10y=4-16x + 10y = 4.
This equation is now equivalent in terms of xx and yy to the second equation, but with a different constant term.

Step 2: Subtract the modified first equation from the second equation:

(16x+10y)(16x+10y)=54 (-16x + 10y) - (-16x + 10y) = 5 - 4 0=1 0 = 1

This result, 0=10 = 1, is a contradiction, indicating that the system is inconsistent.

Therefore, the system of equations has no solution.

3

Final Answer

No solution

Practice Quiz

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Solve the following equations:

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

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