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denpristay [2]
2 years ago
7

Solve this system of equations without graphing and show your reasoning

Mathematics
1 answer:
Drupady [299]2 years ago
7 0

Answer:

x = 1/5

y = 6

Step-by-step explanation:

System:

{5x + y = 7

{20x + 2 = y

First equation:

5x + y = 7 -> y = -5x + 7

Plug into second equation:

20x + 2 = -5x + 7

Subtract 2 from both sides:

20x = -5x + 5

Add 5x to both sides:

25x = 5

Divde both sides by 25:

x = 5/25 -> 1/5

~~~~~~~~~~~~~~~~~~~~~~~~~~~`

Come back to the first equation:

5x + y = 7

Plus in our x:

5(1/5) + y = 7

Multiply:

1 + y = 7

Subtract 1 from both sides:

y = 6

Hope this helps, have a nice day! :D

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The height of a trapezoid is 26 yards and the bases are 14 and 30 yards. What is the area (in square yards)?
faust18 [17]

Answer: 572 yards

Step-by-step explanation:

The equation to find the area of a (base1 + base2) x height/2

The two bases are 14 and 30. Add them up to get 44.

Then, times that by the height. You get 1,144.

Lastly, divide 1,144 by 2. You get 572.

I hope this helped!

5 0
2 years ago
The ratio of the perimeters of two similar triangles is 4:7. What is the area of each of these triangles if the sum of their are
arsen [322]

Answer:

  16 cm^2 and 49 cm^2

Step-by-step explanation:

The ratio of areas is the square of the ratio of linear dimensions, so is ...

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The sum of these "ratio units" is 16 +49 = 65. The sum of triangle areas is 65 cm^2, so each "ratio unit" must stand for 1 cm^2 of area. That is, the triangles must have areas of ...

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3 0
3 years ago
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Natalka [10]
Trapezoidal is involving averageing the heights
the 4 intervals are
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for the first interval
the average between 0 and 0.4 is 0.2
the width is 4
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2nd
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3rd
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width is 1.4
1.4 times 1.25=1.75

4th
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5.49
t=time
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3 years ago
480/X - 8 - 480/x = 3
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Answer:

i don't know its ans thank you

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Find the length of side x.
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Answer:

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Step-by-step explanation:

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