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3 years ago

Find the solution of the system of equations. -7x - 3y = - 20 3x+ 6y = -15

Mathematics

1 answer:

KiRa [710]3 years ago

3 0

Answer:

x = 5 y = -5

Step-by-step explanation:

-7x - 3y = -20

-3y = 7x - 20

y = -7/3x + 20/3

3x + 6(-7/3x + 20/3) = -15

3x - 14x + 40 = -15

-11x = -55

x = 5

-7(5) - 3y = -20

-35 - 3y = -20

-3y = 15

y = -5

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valentina_108 [34]

Answer:

$8,500

Step-by-step explanation:

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What is a .5 radius Circle

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The diameter is 10.

6 0

3 years ago

Quadrilateral ABCD in the figure below represents a scaled-down model of a walkway around a historic site. Quadrilateral EFGH re

Mkey [24]

the picture in the attached figure

Step 1

Find the perimeter of the scaled-down model of a walkway (Quadrilateral ABCD)

$P=AD+DC+CB+BA\\P=3+2+2+4\\ P=11 in$

Step 2

Find the scale factor

if Quadrilateral ABCD is similar to Quadrilateral EFGH

then

$PerimeterEFGH=PerimeterABCD*scale factor$

$scale.factor=\frac{EF}{AB} \\ \\ scale.factor=\frac{60}{4} \\ \\ scale.factor=15\frac{ft}{in}$

Step 3

Find the perimeter of the actual walkway (Quadrilateral EFGH)

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therefore

the answer is

$165 ft$

8 0

3 years ago

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Mashcka [7]

Answer:

Greatest: Denmark

Least: U.S.

Step-by-step explanation:

The population density is calculated by dividing the population by the area.

U.S.

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Denmark

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2 years ago

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Inessa05 [86]

Answer:

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Step-by-step explanation:

$(25xy^{3} )(4xy)(x^{2}y^{2})$

Remove parenthesis:

$25xy^{3}*4xyx^{2}y^{2}$

Separate the constants:

$(25*4)xxx^{2}y^{3}yy^{2}$

Simplify:

$100x^{1+1+2}y^{3+1+2}$

$100x^{4}y^{6}$

6 0

3 years ago