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sammy [17]
2 years ago
10

Mr. Pham wrote the equation below on the board. 18 - 7x = -20.5 What is the value of x?

Mathematics
2 answers:
slavikrds [6]2 years ago
7 0
Use the arithmetic operations to get the variable x on one side of the equation and everything else on the opposite side.

If something is being is being done to a variable, we undo that operation by using the inverse of that operation.

For example, if 10 is being added to x, we use the inverse of addition or subtraction.

18 - 7x = -20.5

We variable x is being multiplied by 7 and is subtracting 18. We need to undo all those operations.

18 - 7x = -20.5
-7x = -38.5

Now the variable is only being multiplied by -7. Reverse the operation.

-7x = -38.5
x = 5.5

So, x is equal to 5.5.
aivan3 [116]2 years ago
5 0

Answer: The answer should be D(x=5 1/2)

Step-by-step explanation:

Trust me I did the equation and work.

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