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seraphim [82]
3 years ago
9

What is the result of subtracting in the second equation from the first? -7x-y=0 7x+8y=-6

Mathematics
1 answer:
Vlad1618 [11]3 years ago
8 0

Answer:

-14x-9y=6

Step-by-step explanation:

we have

-7x-y=0 ---> First equation

7x+8y=-6 --->Second equation

we know that

To subtract the 2nd equation from the first, negate all three of the second equation terms:  -7x-8y=6

and then adds this result with the first equation

so

-7x-y=0\\-7x-8y=6\\--------\\-14x-9y=6

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(03.01 MC)
vekshin1

Answer:

Option (1) will be the answer.

Step-by-step explanation:

Coordinates of the points A and B lying on the line f are (0, 2) and (2, 0) respectively.

Slope of the line f,

m_{1}=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}

m_{1}=\frac{2-0}{0-2}

m_{1}=-1

After dilation of line f by a scale factor of 2, coordinates of A' and B' will be,

Rule for dilation,

(x, y) → (kx, ky)

Where k = scale factor

A(0, 2) → A'(0, 4)

B(2, 0) → B'(4, 0)

Slope of line f',

m_{2}=\frac{0-4}{4-0}

m_{2}=-1

Since, m_{1}=m_{2}=-1

Therefore, both the lines f and f' will be parallel.

Option (1) will be the answer.

6 0
3 years ago
Janet’s car insurance payment decreases by $20 each year. Which expressions represent the total change in her payment,in dollars
Liono4ka [1.6K]

Answer:

Option C is the correct answer.

C.  5•(-20)

Step-by-step explanation:

We are told that the insurance payment for the car follows a certain pattern that can be represented through an expression. The payment is decreasing by $20 every year. As we don't know the total payment amount per period, so we cannot calculate how much is paid per period/year for insurance but we can calculate the rate at which this payment is decreasing.

Change in payment = t * (-20)

The above expressions can be used to calculate the amount of change in payment i payment is decreasing by a constant $20 every year, after t years.

So, if we want to calculate the change in payment after say 5 years, we can replace t with 5 in the equation and calculate the change,

Change in payment = 5 * (-20)

Change in payment = - $100

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2 years ago
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Answer:

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Step-by-step explanation:

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3 years ago
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mestny [16]

Answer:

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Step-by-step explanation:

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2 years ago
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