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3 years ago

9

3(4x + 3) = 2x - 5(3 - x) + 2

2 answers:

ArbitrLikvidat [17]3 years ago

5 0

12x+3=2x-15-x+2 then add two x to both side and solve your answer

strojnjashka [21]3 years ago

5 0

Your answer is: x= -22/5

Here are the steps:

Expand:
12x+9=7x-13

Subtract 9 from both sides:
12x+9-9=7x-13-9

Subtract 7x from both sides:
12x-7x=7x-22-7x

Simplify:
5x=-22

Divide both sides by 5:
5x/5=-22/5

Simplify:
x=-22/5

Thus, x=-22/5.

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11. Which matrix represents the system of equations below?

dimulka [17.4K]

Answer:

$\left[\begin{array}{cccc}-12&-13&13&|15\\7&-10&-3&|11\\7&14&5&\:\:\:|-5\end{array}\right]$

Step-by-step explanation:

The system of equations is;

-12x-13y +13z =15

7x-10y-3z = 11

7x+14y +5z = -5

The coefficient matrix is $\left[\begin{array}{ccc}-12&-13&13\\7&-10&-3\\7&14&5\end{array}\right]$

The constant matrix is $\left[\begin{array}{c}15\\11\\-5\end{array}\right]$

The augmented matrix is $\left[\begin{array}{cccc}-12&-13&13&|15\\7&-10&-3&|11\\7&14&5&\:\:\:|-5\end{array}\right]$

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4 years ago

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Roman55 [17]

Answer:

(3 , 2.5)

Step-by-step explanation:

.5x + y = 4

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7 0

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Step-by-step explanation:

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