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Linear equation are the equation which has the highest power of the unknown variable is 1.The expressions given in the option 1, 2, and 3 are equivalent to .
The equations given in the problem are the linear equations.
<h3>Linear equation</h3>Linear equation are the equation which has the highest power of the unknown variable is 1.
Given-
1) The given expression in the problem is,
Rewrite the equation as,
Take out the negative sign from the bracket,
Rewrite the equation with positive terms first.
Hence the given equation is equivalent to the option 1.
2) The given equation,
On solving further take out the 7 common from the bracket,
Thus the given equation is equivalent to the option 2.
3) The given equation,
Split the term of <em>x,</em>
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Rewrite the equation,
Hence the given equation is equivalent to the option 3.
4) The given equation,
Split the term of <em>x </em>and constant term,
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Rewrite the equation,
Hence the given equation is not equivalent to the option 4.
Thus the expressions given in the option 1, 2, and 3 are equivalent to .
Learn more about the linear equation here;
Answer: The actual distance is 6 km
Step-by-step explanation: If you do a conversion from 1 cm to 20 km in fraction form, you will have
So, if you solve for km, you will get 6 using cross multipulcation