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3 years ago

Use linear combination method to solve this systemof equations. What is the value of x?

Mathematics

1 answer:

lys-0071 [83]3 years ago

7 0

Using the linear combination method, we can add 3x+7y=31 and -3x-2y=-1 together, which makes 5y=30.

Just divide both sides by 5, and your answer will be y = 6.

To solve for x, just substitute 6 in y in either equation and solve for x:

$-3x-2(6)=-1\\ -3x-12=-1\\ -3x=11\\ x=-\frac{11}{3} =-3\frac{2}{3}$

In short, the correct answer is B. -3 2/3

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Answer:

the answer is C.

Step-by-step explanation:

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3 years ago

Which of the following is a Pythagorean Triple?

Elena-2011 [213]

Answer: 3,4,5

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3 years ago

Read 2 more answers

Which best describes the graphs of the line that passes through (−12, 15) and (4, −5), and the line that passes through (−8, −9)

konstantin123 [22]

Answer:

C) They are perpendicular lines.

Step-by-step explanation:

We first need to find the slope of the graph of the lines passing through these points using:

$m = \frac{y_2-y_1}{x_2-x_1}$

The slope of the line that passes through (−12, 15) and (4, −5) is

$m_{1} = \frac{ - 5 - 15}{4 - - 12}$

$m_{1} = \frac{ - 20}{16} = - \frac{5}{4}$

The slope of the line going through (−8, −9) and (16, 21) is

$m_{2} = \frac{21 - - 9}{16 - - 8}$

$m_{2} = \frac{21 + 9}{16 + 8}$

$m_{2} = \frac{30}{24} = \frac{5}{4}$

The product of the two slopes is

$m_{1} \times m_{2} = - \frac{4}{5} \times \frac{5}{4} = - 1$

Since

$m_{1} \times m_{2} = - 1$

the two lines are perpendicular.

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3 years ago

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Mkey [24]

Answer:

1/5(14+×)

Step-by-step explanation:

The sum of 14 and x has to be (14+x)

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