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Multiple Choice
Use the elimination method to solve the following system of linear equations.
A
x=12,y=16
B
x=16,y=12
C
x=43,y=54
D
x=54,y=43
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Verified step by step guidance
1
Write down the system of equations:
\(10x - 4y = 5\)
\(5x - 4y = 1\)
To use the elimination method, subtract the second equation from the first to eliminate \(y\) because both have the same coefficient \(-4y\):
\((10x - 4y) - (5x - 4y) = 5 - 1\)
Simplify the subtraction:
\(10x - 4y - 5x + 4y = 4\)
This reduces to:
\(5x = 4\)
Solve for \(x\) by dividing both sides by 5:
\(x = \frac{4}{5}\)
Substitute \(x = \frac{4}{5}\) back into one of the original equations (for example, \(5x - 4y = 1\)) and solve for \(y\):
\(5 \left( \frac{4}{5} \right) - 4y = 1\)