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2 years ago

Whats the solution to this equation? 3x-9=12

Mathematics

2 answers:

Nutka1998 [239]2 years ago

6 0

Answer:

x=7

Step-by-step explanation:

3x-9=12

add 9 to both sides

3x=21

divide both sides by 3

x=7

xxMikexx [17]2 years ago

5 0

x=7

flububeblehehehhooo

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3 years ago

Two lines, A and B, are represented by the equations given below!

lara [203]

Answer:

The solutions to the system of equations are:

$y=-8,\:x=-4$

Thus, option C is true because the point satisfies BOTH equations.

Step-by-step explanation:

Given the system of the equations

$\begin{bmatrix}y=x-4\\ y=3x+4\end{bmatrix}$

Arrange equation variables for elimination

$\begin{bmatrix}y-x=-4\\ y-3x=4\end{bmatrix}$

$y-3x=4$

$-$

$\underline{y-x=-4}$

$-2x=8$

$\begin{bmatrix}y-x=-4\\ -2x=8\end{bmatrix}$

solve for x

$-2x=8$

Divide both sides by -2

$\frac{-2x}{-2}=\frac{8}{-2}$

$x=-4$

$\mathrm{For\:}y-x=-4\mathrm{\:plug\:in\:}x=-4$

$y-\left(-4\right)=-4$

$y+4=-4$

$y=-8$

The solutions to the system of equations are:

$y=-8,\:x=-4$

Thus, option C is true because the point satisfies BOTH equations.

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2 years ago

If the third of 6 consecutive numbers is 12, what is their sum?

Oksana_A [137]

Answer:

Step-by-step explanation:

If the third of 6 consecutive numbers is 12, what is their sum?

6 numbers = c-2, c-1, c, c+1, c+2, and c+3

The numbers become 10, 11, 12, 13, 14, and 15

Add that together and you get 75.

6 0

2 years ago