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Ainat [17]
3 years ago
6

Solve by elimination 10x-5y=-25 -2x+2y=0

Mathematics
1 answer:
Schach [20]3 years ago
6 0

Answer:

(- 5, - 5 )

Step-by-step explanation:

Given the 2 equations

10x - 5y = - 25 → (1)

- 2x + 2y = 0 → (2)

Multiplying (2) by 5 and adding to (1) will eliminate the term in x

- 10x + 10y = 0 → (3)

Add (1) and (3) term by term

5y = - 25 ( divide both sides by 5 )

y = - 5

Substitute y = - 5 into either of the 2 equations and solve for x

Substituting in (1)

10x - 5(- 5) = - 25, that is

10x + 25 = - 25 ( subtract 25 from both ides )

10x = - 50 ( divide both sides by 10 )

x = - 5

Solution is (- 5, - 5 )

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PLEASE HELP THIS WILL GIVE 50 POINT AND BRAINLIEST!!!!!!
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Step-by-step explanation:

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2 years ago
Mr. Littles is building a triangular sandbox using three boards. He already has two boards that measure 9 feet and 12 feet. Sele
Bess [88]

Answer:

  • 9 feet, 15 feet, 19 feet

Step-by-step explanation:

<u><em> Options are: </em></u>

  • <em>2 feet </em>
  • <em>3 feet </em>
  • <em>9 feet </em>
  • <em>15 feet </em>
  • <em>19 feet </em>
  • <em>21 feet </em>
  • <em>30 feet</em>

<em>-------------------------------------</em>

Use the triangle inequality theorem: sum of any two side must be greater than the third side by length

  • 2 feet     ⇒  no, as 2 + 9 < 12
  • 3 feet     ⇒  no, as 3 + 9 = 12
  • 9 feet     ⇒  yes
  • 15 feet    ⇒  yes
  • 19 feet    ⇒  yes
  • 21 feet    ⇒  no, as 9 + 12 = 21
  • 30 feet  ⇒  no, as 9 + 12 < 30

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2 years ago
The midpoint of is point P at (−16,6). If point A is at (−10,8), what are the coordinates of point B? (−42,20) (−22,4) (−13,7) (
statuscvo [17]

Answer:

B (-22 ,  4)

Step-by-step explanation:

-16=(-10+x)/2

*2      *2

-10+x=-32

+10       +10

x=-22

6=(8+y)/2

*2      *2

12=8+y

-8    -8

4=y

so B(-22,  4)

6 0
3 years ago
Factor 3x^2 minus 12x minus 36 Completely
stepan [7]
3(x-6)(x+2)
hope this helps
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3 years ago
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