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3 years ago

Solve for x −30=5(x−9)x=

Mathematics

2 answers:

babymother [125]3 years ago

8 0

Answer:

Hi! The correct answer is x=3!

Step-by-step explanation:

~Isolate the variable by dividing each side by factors that don't contain the variable~

Wittaler [7]3 years ago

8 0

Answer:

x=3

Step-by-step explain

Distribute

−3 0 = 5 (

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Solve the system of equations:x + 3y - z = -4 2x - y + 2z = 13 3x - 2y - z = -9

tatiyna

Answer:

The solution to the system of equations is

$\begin{gathered} x=\frac{179}{13} \\ \\ y=-\frac{279}{39} \\ \\ z=-\frac{48}{13} \end{gathered}$

Explanation:

Giving the system of equations:

$\begin{gathered} x+3y-z=-4\ldots\ldots\ldots\ldots\ldots\ldots..........\ldots\ldots\ldots\ldots.\ldots\text{.}\mathrm{}(1) \\ 2x-y+2z=13\ldots\ldots...\ldots\ldots\ldots\ldots..\ldots..\ldots\ldots\ldots\ldots\ldots.(2) \\ 3x-2y-z=-9\ldots\ldots\ldots.\ldots\ldots\ldots\ldots....\ldots\ldots.\ldots\ldots\ldots\text{.}\mathrm{}(3) \end{gathered}$

To solve this, we need to first of all eliminate one variable from any two of the equations.

Subtracting (2) from twice of (1), we have:

$5y-4z=-21\ldots\ldots\ldots\ldots\ldots.\ldots.\ldots..\ldots..\ldots\ldots.\ldots..\ldots\text{...}\mathrm{}(4)$

Subtracting (3) from 3 times (1), we have

$3y-5z=-3\ldots\ldots...\ldots\ldots..\ldots\ldots\ldots\ldots\ldots.\ldots\ldots\ldots\ldots\ldots..\ldots\ldots(5)$

From (4) and (5), we can solve for y and z.

Subtract 5 times (5) from 3 times (4)

$\begin{gathered} 13z=-48 \\ \\ z=-\frac{48}{13} \end{gathered}$

Using the value of z obtained in (5), we have

$\begin{gathered} 3y-5(-\frac{48}{13})=-3 \\ \\ 3y+\frac{240}{13}=-3 \\ \\ 3y=-3-\frac{240}{13} \\ \\ 3y=-\frac{279}{13} \\ \\ y=-\frac{279}{39} \end{gathered}$

Using the values obtained for y and z in (1), we have

$\begin{gathered} x+3(-\frac{279}{39})-(-\frac{48}{13})=-4 \\ \\ x-\frac{279}{13}+\frac{48}{13}=-4 \\ \\ x-\frac{231}{13}=-4 \\ \\ x=-4+\frac{231}{13} \\ \\ x=\frac{179}{13} \end{gathered}$

8 0

1 year ago

it takes 1/2 of a box of nails to build a bird house if you wanted to build 5 bird houses how many boxes would you need

dedylja [7]

Answer:

You would need 2.5

Step-by-step explanation:

You can use a porportion to solve.

$\frac{.5}{1} = \frac{x}{5}$ (cross multiply and solve)

7 0

3 years ago

Evaluate x – 2y if x = –3 and y = –6. 1. 15 2. 9 3. -9 4. -15

max2010maxim [7]

Answer:

-15

Step-by-step explanation:

-3 - 2(-6)

-3 -12

-15

6 0

3 years ago

Factor the expression given below. Write each factor as a polynomial in

bezimeni [28]

Answer:

3(343=72y)

Step-by-step explanation:

343x3=1029

1029+216y

both divisible by 3

3(343=72y)

6 0

3 years ago

MissTica

Answer:

$21.80

Step-by-step explanation:

50% of 38 is 19. 10% of 38 is 3.8. Add these together to get 21.8. This equates to $21.80.

7 0

3 years ago

Solve for x −30=5(x−9)x=​

Solve for x −30=5(x−9)x=