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dusya [7]
2 years ago
15

What is the solution of the system? Solve using matrices. 25 points x+2y=9 x+y=1

Mathematics
1 answer:
Novosadov [1.4K]2 years ago
4 0

Answer:

<h2>x = -7 and y=8</h2>

Step-by-step explanation:

<h2> soln</h2><h2>using by elimination method</h2><h2> 1|x+2y=9</h2><h2> 1| x+y=1</h2><h2> |x+2y=9</h2><h2> -|x+y=1</h2><h2> x-x+2y-y=9-1</h2><h2> 0+y=8</h2><h2> y=8</h2>

<h2> 1|x+2y=9</h2><h2> 2|x+y=1</h2>

<h2> |x+2y=9</h2><h2> -|2x+2y=2</h2>

<h2>x-2x+2y+2y=9-2</h2>

<h2>-x=7</h2><h2>divide -1 both side with the make value of x</h2><h2>x=-7</h2><h2>therefore x=-7 and y=8. this is my answer</h2>
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Hunter-Best [27]

9514 1404 393

Answer:

  360

Step-by-step explanation:

Sam obtains a "contribution margin" of $0.50 -0.25 = $0.25 per cookie. That will cover the cost of baking supplies when he sells ...

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Sam needs to sell 360 cookies before he can start making a profit.

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If you like, you can find Sam's break-even point by equating revenue and cost. The is the number of cookies Sam must sell for a profit of 0, that is, for non-negative profit.

  P = R - C

  0 = R - C

  R = C

  0.50n = 90 +0.25n

  0.25n = 90 . . . . subtract 0.25n

  n = 90/0.25 = 360 . . . .divide by the coefficient of n

You may notice this is similar to our description above.

3 0
3 years ago
What is the Equation of this Trend line<br><br> K=_ J+_
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Step-by-step explanation:

8 0
3 years ago
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ivanzaharov [21]
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7 0
3 years ago
Read 2 more answers
What is the first quartile (Q1) of the data set?
KATRIN_1 [288]
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Hope this helps!
8 0
3 years ago
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HACTEHA [7]

Answer:

Step-by-step explanation:

Here you go mate

Step 1

-7x+8<-6  Equation/Question

Step 2

-7x+8<-6  Simplify

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Step 3

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Step 4

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answer

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Hope this helps

7 0
3 years ago
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