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Kamila [148]
3 years ago
7

Solve by addition method 3x+y=8 2x-y=7

Mathematics
1 answer:
Vinil7 [7]3 years ago
7 0

Answer:

(3,-1)

Step-by-step explanation:

So we have the system of equations:

3x+y=8\\2x-y=7

As directed, add straight down. The y-variable will cancel:

5x=15

Now, divide both sides by 5. The left cancels:

x=3

So x is 3.

Now, substitute 3 for x in either of the equations:

3x+y=8

Substitute 3 for x:

3(3)+y=8

Multiply:

9+y=8

Subtract 9 from both sides:

y=-1

So, our answer is: x=3, y=-1 or (3,-1).

And we are done :)

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PLEASE HELP ASAP TYSM
romanna [79]

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Step-by-step explanation:

8 0
2 years ago
HELP!!!!!! I believe its B but I am not sure! :(
n200080 [17]

Answer:

A

Step-by-step explanation:

When solving for x as an exponent, we need to use logarithms in order to undo the operation and rearrange the terms. We use log rules to bring down the exponent and solve. Logarithms are the inverse operations to exponents and vice versa. We have one special kind of logarithm called the natural logarithm whose base is e. We write it as ln. Since our base is e here, we will use the natural logarithm to rearrange and isolate x.

e^{4x-1} =3

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ln e as an inverse simplifies to 1.

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We now apply the inverse operations for subtraction and multiplication.

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Option A is correct.

5 0
3 years ago
F(x)=9x-6<br> what is f(1)
Leto [7]
Hello,

Shall we begin?

<span>F(x)=9x-6
</span>
F(1) = 9 * 1 - 6
F(1) = 9 - 6
F(1) = 3

Answers: 3
8 0
3 years ago
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