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konstantin123 [22]
3 years ago
12

How to do this question plz answer me step by step plzz plz ​

Mathematics
1 answer:
aliya0001 [1]3 years ago
5 0

Answer:

adult cost £7, child cost £2

Step-by-step explanation:

let a represent an adult and c a child , then

2a + 3c = 20 → (1)

a + 4c = 15 → (2)

Multiplying (2) by - 2 and adding to (1) will eliminate a

- 2a - 8c = - 30 → (3)

Add (1) and (3) term by term to eliminate a, that is

- 5c = - 10 ( divide both sides by - 5 )

c = 2

Substitute c = 2 into either of the 2 equations and evaluate for a

Substituting into (2)

a + 4(2) = 15

a + 8 = 15 ( subtract 8 from both sides )

a = 7

The cost of an adult ticket is £7 and a child ticket is £2

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diamong [38]

Answer:

x=-2.25,y=-2.25

Step-by-step explanation:

The given system is

4x - y =  - 9 \\ 3x - 3y = 0

We want to solve the system for x and y that makes the system true.

Let us multiply the first equation by 3 while maintaining the second equation:

12x -3 y =  - 27 \\ 3x - 3y = 0

Subtract the current second equation from the first one.

12x =  - 27

Divide through by 12:

x =  -  \frac{27}{12}  =  - 2.25

From the second equation we have:

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3 years ago
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Neporo4naja [7]

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Step-by-step explanation:

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1 year ago
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snow_lady [41]

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Step-by-step explanation:

4 0
3 years ago
Veronica has been saving dimes and quarters. She has 94 coins in all and the total value is $19.30. How many dimes and how many
Stolb23 [73]

Answer:

Step-by-step explanation:

d + q = 94.....d = 94 - q

0.10d + 0.25q = 19.30

0.10(94 - q) + 0.25q = 19.30

9.4 - 0.10q + 0.25q = 19.30

-0.10q + 0.25q = 19.30 - 9.40

0.15q = 9.90

q = 9.90/0.15

q = 66 <===== there are 66 quarters

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3 0
3 years ago
Plase help me I already set the equation up I just need you to solve it.
masya89 [10]

\sf \frac{6}{30}  =  \frac{x}{100}

Solve for x by cross multiplication

\sf6 \times 100 = x \times 30

  • Multiply the numbers

\sf \: 600 = 30x

  • Swap the sides of equation

\sf \: 30x = 600

  • Divide both sides of equation by 30

\boxed{ \tt \: x = 20}

3 0
2 years ago
Read 2 more answers
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