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Nata [24]
3 years ago
10

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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Step-by-step explanation:

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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:

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

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

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The product of the two slopes is

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

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3 years ago
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