Given that $- 0.3 k + 2.1 = 0.4 k$ , find the value of $k$ .

21

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7

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3

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- 1

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Solution

The correct option is B $3$
$- 0.3 k + 2.1 = 0.4 k$
Add $- 0.4 k$ and $- 2.1$ on both sides, we get
$- 0.3 k + 2.1 - 0.4 k - 2.1 = 0.4 k - 0.4 k - 2.1$
$\Rightarrow - 0.3 k - 0.4 k = - 2.1$
$\Rightarrow - 0.7 k = - 2.1$
Divided by $- 0.7$ , we get
$\frac{- 0.7 k}{- 0.7} = \frac{- 2.1}{- 0.7}$
$\Rightarrow k = 3$

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