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scoundrel [369]
3 years ago
13

Please help me, tomorrow is the deadline.

Mathematics
1 answer:
Helen [10]3 years ago
4 0

I only know the substitutional method so I am going to give you the answers.

1. (remember I am only using the substitutional method, I am doing the method wrong...)

x + y = 10, 3x - y = 2, 5(3x-y) = 5(2), 15x - 5y = 10, 15x -5y = x + y, 14x = 6y, x = 3/7 y , 3/7 y + y = 10, 10/7y = 10, 10 y = 70, y = 7, 14x = 42. x =3

y = 7, x = 3

2. What I know:

x + y = 6

x + 2x = 6

3x = 6

x = 2, y =4

3. I am using a video to help me remember.

x = 2y + 3     2x + 3y = -3.

-3 = 2y - x     -3 = 3y + 2x

0 = - y + 3x,     y = 3x

x = 2(3x) + 3,   x = 6x + 3

-5x = 3,            x = -3/5

y = 3(-3/5)

y = -9/5, x = -3/5

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Answer:

D

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Up to 400 pages, the cost is fixed at 5.00 dollars

After 400 pages the cost is 0.01 cents/page

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A city planner is rerouting traffic in order to work on a stretch of road. The equation of the path of the old route can be desc
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Answer: D

Explanation:

The equation of a line in the point slope form is expressed as

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From the information given, the equation of the path of the old route is

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Recall, the equation of a line in the slope intercept form is expressed as

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By comparing both equations,

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If two lines are parallel, it means that they have the same slope. Given that the new route is to be parallel to the old route and will go through point (Q, P), then

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11 x minus 3 y = negative 17. Negative 4 x + 3 y = negative 18. Negative 7 x = negative 35 Negative 7 x = 35 7 x = negative 35 7
posledela

Answer:

7 x = -35

Step-by-step explanation:

Which equation results from adding the equations in this system? 11 x minus 3 y = -17. Negative 4 x + 3 y = - 18.

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7 x = negative 35

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In this problem we need to add the equations below i.e.

11x-3y = -17 and -4x+3y=-18

Adding both equations,

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