2x+4=8 what would the equation be and what does x equal

Mathematics

2 answers:

Pani-rosa [81]3 years ago

8 0

Answer:

x = 2

Step-by-step explanation:

The equation shown is a perfectly good equation.

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Look at what is being done to the variable. It is multiplied by 2, and 4 is added to the product.

To find the value of the variable, we reverse these operations, in reverse order. We undo the addition by adding the opposite of 4 (to both sides of the equation).

2x +4 -4 = 8 -4

2x = 4 . . . . . simplify

We undo the multiplication by multiplying by the inverse value, 1/2 (to both sides of the equation).

(1/2)(2x) = (1/2)(4)

x = 2 . . . . . simplify

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The rules of equations are pretty simple: <em>whatever you do to one side, you must also do to the other side</em>.

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<em>Comment on this equation</em>

You may notice that all of the numbers in this equation are divisible by 2. Another way to solve it is to start by dividing (both sides!) by 2:

x + 2 = 4

Now, you have a 2nd-grade problem in addition facts: what added to 2 gives 4? Since you know your addition facts, you know the answer is 2. In algebra, we solve this by subtracting 2 (from both sides!).

x = 2

Dafna11 [192]3 years ago

4 0

Answer:

x=2

Step-by-step explanation:

2x+4=8

2x=8-4

2x=4

x=4/2

x=2

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