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Kryger [21]
3 years ago
12

I need to find x and y

Mathematics
1 answer:
MrRa [10]3 years ago
5 0

Answer:

x =  - 2 \\ y =  - 4

Step-by-step explanation:

- 2x + 2y =  - 4  \:  \:  \:  \:  \:  \\ i.e. \:  \:  \:  - x + y =  - 2 \:  \:  \:  \:  \:  \:  \: ...(1)\\ \\  3x + 3y =  - 18   \\ i.e. \:  \:  \:  \:  \:  \: x + y =  - 6\:  \:  \:  \:  \:  \:  \: ...(2)

From (1) we get

x = 2 + y

Now put x = 2 + y in equation (2)

2 + y + y =  - 6 \\ 2 + 2y =  - 6 \\ 2y =  - 6 - 2 \\ 2y =  - 8 \\  \\ y =  -  \frac{8}{2}  \\  \\ y =  - 4

now put y = -4 in equation (1) we get

- x + ( - 4) =  - 2 \\  - x - 4 =  - 2 \\ x  + 4 = 2 \\ x = 2 - 4 \\ x =  - 2

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Simplify: 5(3x -4) - 6( 4 - 3x)
VikaD [51]

Answer:

33x-44

Step-by-step explanation:

15x-20-24+18x

33x-44

5 0
3 years ago
If a store had 330 video games, and 47% of the games were for Xbox, and 53% were for ps4, then how many xbox and ps4 games are i
Bingel [31]

Answer:

The number of games for Xbox is about 155

The number of games for PS4 is about 175

Step-by-step explanation:

Let us find the numbers of games for Xbox and for PS4 game

∵ There are 330 video games in the store

∵ 47% of them were for Xbox

- Multiply 47% by 330

∴ The number of games for Xbox = 47% × 330

∵ 47% = \frac{47}{100}

∴ The number of games for Xbox = \frac{47}{100} × 330

∴ The number of games for Xbox = 155. 1

∴ The number of games for Xbox ≅ 155

∵ 53% of them were for PS4

- Multiply 53% by 330

∴ The number of games for PS4 = 53% × 330

∵ 53% = \frac{53}{100}

∴ The number of games for PS4 = \frac{53}{100} × 330

∴ The number of games for PS4 = 174.9

∴ The number of games for PS4 ≅ 175

4 0
3 years ago
Given the equation y=2x+4, what is the value of y when x=5? *
Law Incorporation [45]

Y=2(5)+ 4
Y= 10+4
Y = 14
6 0
2 years ago
Serena’s average speed during her training run was 8 kilometers per hour over the 2 hours that she ran. What was the total dista
Volgvan

Step-by-step explanation:

so, we just enter the given data into the given formula. and then calculate. it does not get easier than that.

d = 8km/h × 2h = 16km

Serena ran 16km in these 2 hours.

7 0
2 years ago
In a study of
o-na [289]
We know that:
Mean = 82 mm and SD = 10 mm ( standard deviation )
82 - 3 * SD = 82 - 3 * 10 = 82 - 30 = 52 mm
82 + 3 * SD = 82 + 3 * 10 = 82 + 30 = 112 mm
Population between 52 and 112 mm is within +/- 3 standard deviations from the mean.
By the 66- 95 - 99.7 % rule it is: 99.7% of the test group.
0.977 * 500 = 498.5
Answer:
99.7 % of the test group have a diastolic pressure between 52 and 112 mm, or 498 men. 
5 0
3 years ago
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