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Choose the Missing a step in the given solution to the inequality : -x- 10 > 14 +2x

-x - 10 > 14 +2x
-3x - 10 > 14
————————
X< -8

Answer choices: A: -3x>24 B:-3x>4 C: -3x> -4 D: -3x<24

User Leena
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2 Answers

4 votes

A: -3x>24

The working is shown

Choose the Missing a step in the given solution to the inequality : -x- 10 > 14 +2x-example-1
User Rangi Lin
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6.4k points
5 votes

Answer:

A: -3x > 24

Explanation:

The missing step above is the result of adding 10 to both sides of the inequality.

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Comment on the solution of this inequality

The solution shown is correct and gives correct results, but it requires that you divide by a negative number. That division can be by a positive number if the first step is to add x to both sides. Then the second step is to subtract 14 and you get ...

-24 > 3x

Division by a negative number is not required, and the direction of the inequality stays the same:

-8 > x

Further comment on the solution

Using left-pointing inequality symbols (< or ≤) arranges the left-right order of the operands the same way they are arranged on the number line. That is, for the solution to this inequality, all of the values of x are to the left of -8 on the number line. Writing the inequality in the form ...

x < -8

can help you see that. A bit of mental gymnastics is required when the inequality is written ...

-8 > x

and you want to graph or choose values of x that match this result. Of course, once you have -8>x, you can easily swap sides to make it x<-8.

User Wquist
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5.4k points