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skelet666 [1.2K]
3 years ago
15

Solve the system of equations by substitution.

Mathematics
1 answer:
mojhsa [17]3 years ago
6 0

Answer:

6 = −4x + y

−5x − y = 21  

Answer:  (-3, -6)


2x + y = 20 6x – 5y = 12  

Answer:

(7 , 6)


Step-by-step explanation:

Solve the system of equations by substitution.

6 = −4x + y --> y = 4x + 6

−5x − y = 21

Substitute y = 4x + 6 into −5x − y = 21

−5x − (4x + 6) = 21

-5x - 4x - 6 = 21

-9x = 27

  x = - 3

y = 4(-3) + 6

y = -12 + 6

y = -6

(-3, -6)


Solve the system by the elimination method.

2x + y = 20

multiply the equation by (-3) ; 2x + y = 20  so

-6x - 3y = - 60

6x – 5y = 12

------------------add

-8y = - 48

  y = 6

2x + y = 20

2x + 6 = 20

2x = 14

 x = 7

(7 , 6)

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F(7) if f(x)=-3x-2 ​
Paul [167]

Answer:

f(7) = -23

Step-by-step explanation:

f(x) = -3x - 2

f(7) = -3(7) - 2

f(7) = -21 - 2 = -23

4 0
2 years ago
The Bishop's Peak 4-H club is having its annual fundraising dinner. Adults pay $35 apiece and children pay $25 apiece. If the nu
vodka [1.7K]
35a + 25c = 2660
a = 2c

35(2c) + 25c = 2660
70c + 25c = 2660
95c = 2660
c = 2660/95
c = 28 <=== there were 28 children tickets

a = 2c
a = 2(28)
a = 56 <== there were 56 adult tickets
4 0
3 years ago
Can sum1 do this for me
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5 0
3 years ago
Shiloh has to earn at least $200 to meet her fundraising goal. She has only 100 cakes that she plans to sell at 5 dollars each.
kakasveta [241]
Here is the inequality you can enumerate:

5x >= 200, this means the money you sold for cakes must be larger or equal to your goal

x <= 100, this means you cannot sell more than 100 cakes, because you only have 100 cakes

Solve for them, you will get: 40 <= x <= 100
5 0
3 years ago
Hi I really need help
denis-greek [22]

To solve this, you can first solve each expression:

35 / 6 = 5.83333

5 + 3/10 = 5.3

5 = 5

35 / 10 = 3.5

15 / 5 = 5

5 + 5/6 = 5.8333333

3 = 3

10 * 1/2 = 5

So, the tiles of 5, 15*1/5, and 10*1/2 all equal 5.

The tiles of 35/6 and 5+5/6 equal 5.83333.

The remaining tiles to not have matches.

4 0
3 years ago
Read 2 more answers
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