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alekssr [168]
3 years ago
9

2a - 3b = -11 a + 3b = 8

Mathematics
1 answer:
dlinn [17]3 years ago
8 0

Answer:

b = 3 and a = -1

Step-by-step explanation:

You have your given equation:

2a - 3b = -11

a + 3b = 8

You need to find what a and b is.

To find b:

2a - 3b = -11

-2a - 6b = -16

I multiplied a + 3b = 8 by -2. When you multiply a number you have to multiply all of them. You have to choose a number that would cancel out all of a.

So now your equation would look like this when you solve for b:

2a - 3b = -11

-2a - 6b = -16

-------------------

a - 9 = -27 then you divide -9 to -27 which is 3 so b = 3.

To find a:

2a - 3b = -11

a + 3b = 8

I multiplied a + 3b = 8 by -1 and 2a - 3b = -11 by -1 as well.

Your equation will look like this when you solve for a:

-2a + 3b = 11

-1a - 3b = -8

------------------

-3a = 3 then divide -3 to 3 which is -1 so a = -1.

Check to see if you have the correct answer by plugging in the number you got for a and b into the equation and solve.

1. 2(-1) -3(3) = -11

 -2 - 9 = -11

2. -1 + 3(3) = 8

   -1 + 9 = 8

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Answer:

This is my answer↓:

Step-by-step explanation:

He school play sold $550 in tickets one night.

The number of $8 adult tickets was 10 less than twice the number of

$5 child tickets.

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Let say child ticket sold = x

Adult tickets was 10 less than twice the number of    child tickets.

=> Adult ticket sold = 2x - 10

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=> Revenue = 5x  $

Adult ticket sold = 2x - 10

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=> Revenue = 8(2x - 10) =16x - 80 $

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=> 21x = 630

=> x = 30

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Mark as brainlist, thanks me, and rate. Hope it helps!!!

8 0
2 years ago
What is the length of the figure?
nadezda [96]
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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

Do the actual work:  solve for x:

Divide both sides by 107.06:

          16

x < -------------- = 0.149    This does not agree well with any of your answer

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