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3 years ago

What is the value of x+2y if -3x-6y=24

Mathematics

1 answer:

almond37 [142]3 years ago

8 0

Answer:

- 8

Step-by-step explanation:

Given

3x - 6y = 24 ( divide all terms by - 3 )

x + 2y = - 8

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What is the substitution of -6x-8y=-20 and x+6y=-6

ale4655 [162]

Substitution doesn't work for this, but elimination does.

-6x-8y=-20 +6( x+6y=-6)

-6x-8y=-20 + 6x+36y=-36

-6x and 6x cancel each other, add -8 and 36 to get 28, and -20 and -36 to get -56.

28y=-56

divide by 28 on both sides.

Y= -2

Then substitute y into one of the equations.

x+6(-2)=-6

x-12=-6

x=6

The ordered pair is (6,-2).

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3 years ago

Read 2 more answers

Find the domain of f(x)=x-9/x squared-81

vagabundo [1.1K]

$f(x)=\dfrac{x-9}{x^2-81}\\\\\text{The domain:}\\\\x^2-81\neq0\qquad\text{add 81 to both sides}\\\\x^2\neq81\to x\neq\pm\sqrt{81}\\\\x\neq-9\ \wedge\ x\neq9\\\\Answer:\ \boxed{\text{All real numbers except -9 and 9}}\to\boxed{x\in\mathbb{R}-\{-9,\ 9\}}$

7 0

3 years ago

How to find unknown side

Elan Coil [88]

Answer:

C = 10

Step-by-step explanation:

Find the last side of the triangle using the Pythagorean theorem.

$a^{2} +b^{2} =c^{2}$

You have a and b already, a = 6, b = 8

$6^{2} +8^{2} =c^{2} \\\\$

solve this to get

$64 + 36 = \sqrt{100}$

C = 10

Apply the same to the other 2 triangles. C is your longest side!

3 0

2 years ago

Serenity Spa charges $59 for a one hour massage. They charge $0.95 per minute for each additional minute over an hour. If

Yanka [14]

Answer:

D. y = 0.8x + 79

Choices:

y = 79x + 0.8

y = -0.8x + 79

y = 79.8x

y = 0.8x + 79

5 0

3 years ago

-(x+6)-12=36 help me! Please

zmey [24]

Answer:

x=42

Step-by-step explanation:

-(42+6)-12=36

-(48)-12=36

48-12=36

hope this helps

4 0

3 years ago