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Umnica [9.8K]
3 years ago
10

How do I do pre-Algebra???

Mathematics
1 answer:
Lana71 [14]3 years ago
7 0

Hey there!

The main concept of pre-algebra is solving equations for variables in them.

For example, let's say you have the algebraic equation below.

x+1=3

With algebra, you need to figure what x is equal to. To do so, you will use inverse operations on both sides of the equation to isolate x one side, showing what it is equal to.

We would subtract 1 to both sides to isolate x on one side.

x+1-1=3-1

As you can see, +1-1=0, therefore, this would give us x+0, or just x. Now it is isolated and will show us what it is equal to.

x=3-1

x=2

Therefore, in our equation x+1=3, x would be equal to 2.

I hope this explanation helps! Have a great time here at Brainly!

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Answer:

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Step-by-step explanation:

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2 years ago
Use the substitution method to solve.
lord [1]

Answer:

x = 7, y = 6

Step-by-step explanation:

solve for y for the first equation

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now that we have found y, substitute the y in for the second equation

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then y = 20 - 2x = 20 - 2*7 = 6

check:

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4 0
3 years ago
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Step-by-step explanation:

hope this helps.

7 0
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Answer:

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