A, because its reflecting off of the y axis
Answer:

Step-by-step explanation:
The only thing important in this question in the original equation is the slope, which is 3, the multiplyer for x. To find the opposite slope follow the steps below.
The first step is to make the original slope into a fraction.

Then flip the numerator and denominator.

Now multiply this value by -1.

There is the opposite slope of 3.
Hey!
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The opposite of -10 is 10.
Number line in image below.
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Hope This Helped! Good Luck!