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Alja [10]
3 years ago
13

Solve –4x = –36. –9 –32 9 –40

Mathematics
2 answers:
MArishka [77]3 years ago
8 0
Hi there!

Great question! :D

Since there is a variable right next to the -4, we know it means to multiply. But, we will do the opposite operation - Division!

Here's how it works:

Divide both sides by -4. Why both? Because what you do to one side, you have to treat the other equally (or the other will feel slighted!).

\frac{-4x}{4} =  \frac{-36}{4}

x = 9

Now, we can see simply that x = 9

Here's a question some people ask when solving for x -

* Why is that the answer? How do you know?

Because you can always substitute the x for the 9. Earlier we mentioned that a variable next to a number means to multiply.

So, -4 * 9 = -36 WE WERE RIGHT!!!

Another question:

*Negative 36? Why would the answer not be -9?

We can eliminate 2 answers already - The negative ones. Negative + negative = positive, and our 36 here is negative, and the 9 is positive, and so a formula you want to keep in mind is:

negative + positive = negative.
positive + positive = negative.
negative + negative = positive.

Hope this helps! :D
butalik [34]3 years ago
5 0
First you start out with your equation:
-4x = -36

Using reverse operations, divide both sides by -4. Since you're dividing a negative by a negative, you get a positive answer.

x = 9
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