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2 years ago

How do u solve x-y=3 6x+4y=13

2 answers:

7 0

X - y = 3
6x + 4y = 13

x = y + 3

6(y + 3) + 4y = 13
6y + 18 + 4y = 13
10y = 13 - 18
10y = - 5
y = - 5/10
y = - 1/2

x = - 1/2 + 3
x = - 1/2 + 6/2
x = 5/2

zvonat [6]2 years ago

6 0

$\left \{ {{x-y=3\ \ \ |\cdot4} \atop {6x+4y=13}} \right. \\\\ \left \{ {{4x-4y=12} \atop {6x+4y=13}} \right. \\+-----\\\\10x=25\ \ \ |:10\\x=2.5\\\\2.5-y=3\\2.5-3=y\\y=-0.5\\\\ \left \{ {{y=-0.5} \atop {x=2.5}} \right.$

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$\qquad\qquad\huge\underline{{\sf Answer}}$

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7 0

2 years ago

One scientific team determened that the avrage thickness of a chickens egg shell is 0.311 millimeters

rosijanka [135]

Answer:

As we can see the average for the thickness of a chickens egg shell is 0.311 mm and if we want to round this number to the nearest tenth we just need to see the second decimal place and round to one decimal place.

This second decimal place for this number is 1 and this number is $\leq 5$ so then if we round to the nesrest tenth we will get:

$0.3 mm$

Step-by-step explanation:

We use the following info in order to complete the qeustion:

Round the thickness of the shell to the nearest tenth.

0.3

0.5

0.92

This second decimal place for this number is 1 and this number is $\leq 5$ so then if we round to the nesrest tenth we will get:

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3 years ago

A puppy is tied to a leash in a back yard. His leash is 3 meters long, and he runs around in circles pulling the leash as far as

Harlamova29_29 [7]

its 9 meters and 20

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3 years ago

Read 2 more answers

Please help!!

vitfil [10]

Answer:

Step-by-step explanation:

Question says that it uses 120 feet of fencing material to enclose three sides of the play area. This means there are 3 sides. Putting this into equation, we have something like this.

120 = L + 2W

Where

LW = area.

Again, in order to maximize the area with the given fencing, from the equation written above, then Width, w must be = 30 feet and length, l must be = 60

On substituting, we have

A = LW = (120 - 2W) W

From the first equation, making L the subject of the formula, we have this

L = 120 - 2W, which then we substituted above.

On simplification, we have

L = 120W -2W²

Differentiating, we have

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Remember that W = 30

So therefore, L = 120 - 2(30) = 60 feet

4 0

2 years ago

7x+11 >5x-5 Can someone helpp

PSYCHO15rus [73]

Answer:

x>-8

Step-by-step explanation:

7x+11>5x-5

2x+11>-5

2x>-16

x>-8

the > sign acts like an equal sign :)

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3 years ago

Read 2 more answers