To find the equation K is solving that leads to her second step being to multiply both sides by 4, we need to consider the options given:
a. \(4 + 6x = 1\)
b. \(6 + \frac{x}{4} = 1\)
c. \(4 + \frac{x}{6} = 1\)
d. \(6 + 4x = 1\)
We can analyze each equation and see what happens when we make the second step of multiplying both sides by 4:
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For option (a) \(4 + 6x = 1\):
- This equation does not require multiplication of both sides by 4 to isolate \(x\).
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For option (b) \(6 + \frac{x}{4} = 1\):
- Multiply both sides by 4: \[ 4 \cdot (6 + \frac{x}{4}) = 4 \cdot 1 \implies 24 + x = 4 \]
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For option (c) \(4 + \frac{x}{6} = 1\):
- Multiply both sides by 6: \[ 6 \cdot (4 + \frac{x}{6}) = 6 \cdot 1 \implies 24 + x = 6 \]
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For option (d) \(6 + 4x = 1\):
- This equation does not require multiplication of both sides by 4 to isolate \(x\).
From these analyses, the only option where K would need to multiply both sides by 4 as her second step is option (b):
b. \(6 + \frac{x}{4} = 1\).