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777dan777 [17]
2 years ago
13

Please help!! 2y = -1 + 9 3х — бу : -15 M

Mathematics
1 answer:
nikklg [1K]2 years ago
8 0
• Rearrange first equation
x + 2y = 9

• Multiply the first equation by 3
3(x + 2y = 9)

• Rewrite equation 1
3x + 6y = 27

• Write both equations
3x + 6y = 27
3x - 6y = -15

• Subtract equation 1 from equation 2
3x + 6y = 27
-
3x - 6y = -15

• Write the reaming values
12y = 42

• Divide both side by 12 to solve for y
12y = 42 ➗ 12

• Write value of y
y = 3.5

• Substitute the value of y into one of the original equations
2(3.5) = -x + 9

• Use algebra and sole for x
7 = -x + 9
x = 9 - 7
x = 2

• Write final point
(3.5, 2)
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11x + 6y = 6 then graph the equation ​
maw [93]

Answer:

Step-by-step explanation:

Use the intercept method of graphing a straight line:

Let x = 0.  We get y = 1.  This is the y-intercept (0, 1).

Let y = 0.  We get x = 6/11.  This is the x-intercept (6/11, 0).

Plot both points and then draw a straight line through them.

6 0
3 years ago
Un cono ha l'area laterale di 255 pigreco cm^2, l'apotema di 17 cm e pesa 900 pigreco g. Calcola il peso specifico del materiale
valkas [14]

Answer:

The specific weight is 1.5\frac{g}{cm^{3}}

Step-by-step explanation:

The question in English

A cone has a lateral area of 255 pi cm^2, an apothem of 17 cm and weighs 900 pi g. It calculates the specific weight of the material of which it is composed

step 1

Find the radius of the cone

we know that

The lateral area of a cone is equal to

LA=\pi rl

we have

LA=255\pi\ cm^{2}

l=17\ cm

substitute the values

255\pi=\pi r(17)

Simplify

255=r(17)

r=255/(17)=15\ cm

step 2

Find the height of the cone

Applying the Pythagoras Theorem

l^{2} =r^{2} +h^{2}

substitute the values and solve for h

17^{2} =15^{2} +h^{2}

h^{2}=17^{2}-15^{2}

h^{2}=64

h=8\ cm

step 3

Find the volume of the cone

The volume of the cone is equal to

V=\frac{1}{3}\pi r^{2}h

substitute the values

V=\frac{1}{3}\pi (15)^{2}(8)

V=600\pi\ cm^{3}

step 4

Find the specific weight

Divide the mass by the volume

\frac{900\pi }{600\pi}=1.5\frac{g}{cm^{3}}

4 0
3 years ago
Finding the missing length in a figure
bazaltina [42]

Answer:

6 ft

Step-by-step explanation:

6 0
3 years ago
Question
hichkok12 [17]

Answer:

Area: 201.06

Circumference:50.26

Step-by-step explanation:

Area of a circle: pi*r^2

8^2=8*8=64

64*pi=201.06193 Rounded to the neares hundredth=201.06

_________________________________________________

Circumference of a circle: 2pi * r

2*8=16

16*pi=50.2654825 Rounded to the nearest hundredth = 50.26

4 0
2 years ago
A 20-foot ladder is leaning against a tree. The bottom of the ladder is 12 feet away from the bottom of the tree. Approximately
jarptica [38.1K]

Using the Pythagorean Theorem we can solve.


20^2 - 12^2 = X^2

400 - 144 = X^2

256 = X^2

X = √256

X = 16 feet.


The answer is D.

4 0
3 years ago
Read 2 more answers
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