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Vilka [71]
3 years ago
5

Help i was sick and missed this lesson

Mathematics
1 answer:
AleksandrR [38]3 years ago
5 0
1.
x - 2y = -19
5x + 2y = 1 /+

6x = -18 / 6
x = -3

-3 - 2y = -19
-2y = -16. / ÷(-2)
y = 8


2.
3x + 4y = 18
-2x + 4y = 8 / ×(-1)

3x + 4y = 18
2x - 4y = -8 /+

5x = 10 / ÷5
x = 2

3 × 2 + 4y = 18
6 + 4y = 18 / -6
4y = 12 / ÷4
y = 3


3.
2x + y = 3
-x + 3y = -12 / ×2

2x + y = 3
-2x + 6y = -24 /+

7y = -21 / ÷7
y = -3

2x - 3 = 3 / +3
2x = 6 / ÷2
x = 3


Hit me up in comments if anything is unclear.
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olya-2409 [2.1K]

Answer:

Step-by-step explanation: 60 x 3= 380

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3 0
3 years ago
Jasmine's plane ticket cost $466.88. She has already saved 25% of the cost of the ticket. During the next 2 weeks, she will save
tresset_1 [31]

Answer: She would save $175.08 during each of the next 2 weeks.

Step-by-step explanation:

Jasmine's plane ticket cost $466.88. She has already saved 25% of the cost of the ticket. This means that the amount that she already saved is

25/100 × 466.88 = $116.72

The amount remaining would be

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3 0
3 years ago
Help please i will give 30 points
Nata [24]

Answer:

C. 7h + 50 > 99

Step-by-step explanation:

She earns <u>more</u> than $99, so you know that the sign will be > (more than).

h is the number of hours, so to find how much she earns for working h hours at $7/hour, you multiply h by 7  ---  7h

She also earns an additional $50, which will be +50.

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5 0
2 years ago
Which quadratic equation has solutions x=8 and x=−1?
andrezito [222]
There are two ways you can do this

Using the formula


{x}^{2}  - (sum \: of \: roots)x + poduct \: of \: roots = 0

{x}^{2}  - (8+-1)x +  - 1 \times 8 = 0


{x}^{2}  - 7x  - 8 = 0


Working backwards


x = 8 \: or \: x =  - 1
\Rightarrow x-8=0  \: or  \: x+1=0

\Rightarrow (x-8)(x + 1)=0
\Rightarrow  {x}^{2}   + x -8x - 8 = 0
\Rightarrow  {x}^{2}  - 7x - 8 = 0
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BartSMP [9]
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4 0
3 years ago
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