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Travka [436]
3 years ago
13

1.) 2x + y = 3 2.) x - 2y = -1 If equation 1 is multiplied by 2 and then the equations are added, the result is

Mathematics
1 answer:
Alexus [3.1K]3 years ago
5 0
3×2=6
6+(-1)=6-1=5
The answer is 5
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A farmer had twice as many chickens as ducks on his farm. After he sold 166 chickens and ducks, he had half as many chickens as
mamaluj [8]

Answer:

The farmer have at first <u>202</u> chickens.

Step-by-step explanation:

Given:

A farmer had twice as many chickens as ducks on his farm. After he sold 166 chickens and ducks, he had half as many chickens as ducks left.

Now, to find the chickens farmer have at first.

Let the chickens be x.

And, the ducks be y.

<em>As, the farmer had twice as many chickens as ducks on his farm.</em>

So, x=2y    ......(1)

<em>As, given the farmer after selling 166 chickens and ducks, he had half as many chickens as ducks left.</em>

According to question:

x-166=(y-29)\times \frac{1}{2}

x-166=\frac{y-29}{2}

Substituting the value of x from equation (1) we get:

2y-166=\frac{y-29}{2}

<em>By cross multiplying we get:</em>

4y-332=y-29

<em>Adding both sides 332 we get:</em>

4y=y+303

<em>Subtracting both sides by </em>y<em> we get:</em>

3y=303

<em>Dividing both sides by 3 we get:</em>

y=101.

Now, to get the number of chickens substituting the value of y in equation (1):

x=2y\\\\x=2\times 101\\\\x=202.

Therefore, the farmer have at first 202 chickens.

7 0
3 years ago
Help me find my answer
Sergeu [11.5K]

Step-by-step explanation:

3 cookies= 240 cal

∴ 1 cookie= 240÷3 cal

∴ 5 cookies= (240÷3) × 5

⇒ 240÷3= 80

⇒ 80 × 5= 400

[ans] 400 cal

4 0
3 years ago
A cylinder has a diameter of 6 ft and height of 9 ft. What is the volume of this cylinder?
Setler79 [48]
First, you've got to figure out the value of the radius so divide the diameter by two. Then, you'll want to find the area of the base or pi times radius squared.
(3.14x3^2)x9=V
After doing the math your answer comes out to 254.34 cubic feet or feet^3
7 0
3 years ago
Long Division of Polynomials | Divide (28n² + 13n + 4) = (7n + 5)
Nady [450]

Answer:

(28n²+13n+4) ÷ (7n+5) = 4n-1 remainder 9

Step-by-step explanation:

4 0
3 years ago
PLEASE HELP ME ...........Julie was looking at the architect's blueprint of her house. The scale on blueprint was 1/4 inch = 1 f
MAVERICK [17]

Answer:

On the blueprint the dimensions are <u>48 inches by 64 inches</u>.

Step-by-step explanation:

Given:

The scale on blueprint was 1/4 inch = 1 foot.

The actual dimensions of her bedroom are 12 feet by 16 feet.

Now, to find the dimensions on the blueprint.

Let the dimensions on the blueprint be x by y.

As, given the scale on blueprint:

\frac{1}{4}\ inch=1\ foot

So, \frac{1}{4}\ inch  is equivalent to 1 foot.

Thus, x is equivalent to 12 feet.

And, y is equivalent to 16 feet.

Now, solving by cross multiplication method:

\frac{\frac{1}{4}}{1} = \frac{x}{12}

\frac{4}{1} =\frac{x}{12}

<em>By cross multiplying we get:</em>

48=x

x=48\ inches.

Now, again:

\frac{\frac{1}{4}}{1} =\frac{y}{16}

\frac{4}{1} =\frac{y}{16}

<em>By cross multiplying we get:</em>

64=y

y=64\ inches.

Therefore, on the blueprint the dimensions are 48 inches by 64 inches.

6 0
3 years ago
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