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Ksju [112]
2 years ago
13

Choose a method you prefer to solve for a system of linear equations. 2x + 4y = -4 2x-y=6

Mathematics
1 answer:
Artyom0805 [142]2 years ago
7 0

Answer:

Elimination

x = 2

y = -2

Step-by-step explanation:

Elimination

2x + 4y = -4

2x - y = 6

Subtract the second equation from the first

5y = -10

Divide both sides by 5

y = -2

---------------------

Substitute for y = -2 in the second equation

2x - -2 = 6

2x + 2 = 6

subtract 2 from both sides

2x = 4

Divide both sides by 2

x = 2

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Answer: OPTION D.

Step-by-step explanation:

The formula that is used to calculate the slope of a line is:

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

Where (x_1,y_1) and (x_2,y_2) are two points on the line.

In this case the student finds the slope of the line that passes trough these points:

(8, 17)\\(1, 4)

You can notice that she writes in the numerator that:

y_2=17\\y_1=4

So she chose the point (1, 4) as (x_1,y_1)  and the point (8, 17) as (x_2,y_2).

Then x_2 and x_1 in the denominator must be:

x_2=8\\x_1=1

Therefore, she did not keep the order of the points the same in the numerator and the denominator.

6 0
3 years ago
Two numbers have a sum of 22 the difference is four what are the two numbers
Bess [88]

Answer: 13+9 = 22

Step-by-step explanation:

6 0
2 years ago
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vivado [14]

Answer:

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Step-by-step explanation:

In this geometric, sequence, you are multiplying by -5. So, we can continue the sequence by mulitplying 375(your last value) by -5 and so on, until we have 7 total terms.

Now we add the terms together:

-3+15+-75+375+-1875+9375+-46875

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Hope this helps :)

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Answer:

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Step-by-step explanation:

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Answer:

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