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liubo4ka [24]
3 years ago
5

10x + 7y = –8 7x + 7y = –14

Mathematics
1 answer:
Georgia [21]3 years ago
4 0

Answer:

(2, - 4 )

Step-by-step explanation:

Given the 2 equations

10x + 7y = - 8 → (1)

7x + 7y = - 14 → (2)

Subtract (2) from (1) term by term to eliminate y

(10x - 7x) + (7y - 7y) = - 8 - (- 14) , that is

3x = 6 ( divide both sides by 3 )

x = 2

Substitute x = 2 into either of the 2 equations and solve for y

Substituting into (1)

10(2) + 7y = - 8

20 + 7y = - 8 ( subtract 20 from both sides )

7y = - 28 ( divide both sides by 7 )

y = - 4

solution to the system of equations is (2, - 4 )

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Answer: 20
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4 0
2 years ago
NEED HELP I GOT 15MINS%$!
goldenfox [79]

Answer:

The answer is option 2.

Step-by-step explanation:

First, you have to eliminate brackets, you have to divide -1.5 to both sides :

- 1.5(4 - r) =  - 12

- 1.5(4 - r) \div  - 1.5=  - 12 \div  - 1.5

4 - r = 8

Next you have to solve r :

4 - r = 8

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8 0
3 years ago
Read 2 more answers
There are 2 seats on the left side on each row and 3 seats on the right side there are 90 seats on the right side of the plane h
arsen [322]

Answer:

Total number of seats on plane is 150 seats.

Step-by-step explanation:

Number of seats on left side = 2 in each row

Number of seats on right side = 3 in each row

Total number of seats on right side = 90

Number of rows = total number of seats on right side/ number of seats on right in each row

Number of rows = 90 / 3 = 30 rows

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Total number of seats = total seats on right side + total seats on left side

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Hence total number of seats on plane is 150 seats.

6 0
3 years ago
Which of the following expressions are equivalent to −5.93+(−8.62)+5.93?
vampirchik [111]

Answer:

  • A, B, C, D

Step-by-step explanation:

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  • −(5.93 + 8.62) + 5.93 =       C
  • −5.93 −8.62 - (- 5.93) =       D
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7 0
3 years ago
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pshichka [43]
0 is the correct answer I think
4 0
2 years ago
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