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Ivan
3 years ago
5

Using Substitution solve: y=x+5 4x+y=20

Mathematics
1 answer:
Vladimir [108]3 years ago
4 0

Answer:

3

Step-by-step explanation:

So first, plugin y to your equation, it should look like this: 4x+x+5+20. Now, we can solve this. Next, we have two x's so we can combine them. The equation will now look like this: 5x+5=20. Now, we have an extra 5 laying around that we need to get rid of, so we can subtract that 5 to both sides of the equation and we get this: 5x-5=20-5 which ends up being 5x=15. Now, we just divide both ides by 5 and since 15 divided by 5 is 3, we get: x=3

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3 years ago
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3 years ago
How do we know what sign goes outside of the bracket when factoring binomials?
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More often than not, it's going to be positive. For example, 4x^2 - 2x = 0. That would factor out to be 2x(2x-1) = 0. The sign outside is going to be positive because it's simpler to solve that way. Here, x is equal to 0 and equal to 1/2. Taking out a negative in this case would complicate the solving process.
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3 years ago
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Step-by-step explanation:

The variable that we can change is called the Explanatory Variable.

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