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kramer
3 years ago
5

Solve each system by elimination 6x+3y=21 -12x+y=-7

Mathematics
2 answers:
Olenka [21]3 years ago
5 0

Answer:

x=1,y=5

Step-by-step explanation:

6x+3y=21....(1)

-12x+y=-7.....(2)

From (2) make y the subject of formula

y=-7+12x...(3)

Substitute (3) into (1)

6x+3(-7+12x)=21

6x-21+36x=21

Collect like terms

6x+36x=21+21

42x=42

Divide both sides by 42

x=1

Substitute the value of x into (3)

y=-7+12(1)

y=-7+12

y=5

Therefore x=1,y=5

AnnyKZ [126]3 years ago
4 0

Answer:

(x,y)=(1,5)

Step-by-step explanation:

6x+3y=21/*2

-12x+y=-7

12x+6y=42 (1)

-12x+y=-7 (2)

(1)+(2): 7y=35

-12x+y=-7

y=35/7

-12x+y=-7

y=5

-12x+5=-7

y=5

-12x=-7-5

y=5

-12x=-12

y=5

x=-12/(-12

y=5

x=1

(x,y)=(1,5)

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I’m pretty sure it’s y=-4x-16

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Hope this helped
3 0
2 years ago
Zero divided by zero?​
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Step-by-step explanation:

Any number divided by zero, its value can't be determined. Hence it is called as indeterminate form. So is with zero divided by zero.

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3 years ago
A honeybee flaps its wings 200 times per second.how much time is required for one wingbeat? give your answere in millisecond
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The time required for one wing beat is 5 milliseconds.

<em><u>Explanation</u></em>

Lets assume, the time required for one wing beat is  t seconds

So, the time required for 200 wing beat = 200t seconds

Given that, the honeybee flaps its wings 200 times per 1 second. So...

200t=1 \\ \\ t=\frac{1}{200}seconds\\ \\ t= (\frac{1}{200}*1000 )milliseconds\\ \\ t=( 5 )milliseconds

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A rectangle is 6 inches longer than it is wide. The perimeter of the rectangle is 44 inches.Write and solve an equation for the
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Answer:

Length is 14 in

Width is 8 in

Step-by-step explanation:

<u>Given:</u>

  • Length = l
  • Width = w
  • Perimeter = P = 44 in
<h3>Solution</h3>

<u>Equations as per given:</u>

  • l - w = 6
  • P= 2(l+w) = 44 ⇒ l +w = 22

<u>Adding up the two equations:</u>

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<u>Then finding the value of w:</u>

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<u>Answer:</u> The length of the rectangle is 14 inches and width is 8 inches

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