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stepan [7]
2 years ago
7

The cost of 25 litres of petrol is Rs.1400.Find the cost of 30 litres of petrol.​

Mathematics
1 answer:
Leona [35]2 years ago
7 0
Rs.1680

Liter. Rs
————-|————-
25 | 1400
:5( | ):5
5 | 280
x6( | )x6
30 | 1680
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Solve the system of linear equations using any method 6x+6y=-6, 5x+y=-13
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Answer:

x=-3

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Step-by-step explanation:

To solve this problem you can use the elimination method:

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- Add both equations:

6x+6y=-6\\-30x-6y=78\\-------\\-24x=72\\x=-3

- Substitute the value of x into one of the original equations and solve for y:

6(-3)+6y=-6\\-18+6y=-6\\6y=12\\y=2

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Answer:

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