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emmainna [20.7K]
2 years ago
8

Two times a number added to another number is 25. Three times the first number minus the other number is 20. Find the numbers.

Mathematics
1 answer:
lesantik [10]2 years ago
7 0

Answer:

first number is 9

second number is 7

Step-by-step explanation:

2x + y = 25

3x - y = 20

Add the two equations so that 'y' is eliminated:

5x = 45

x = 9

2(9) + y = 25

18 + y = 25

y = 7

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Answer:

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Step-by-step explanation:

* Lets explain the inverse of the function

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- We have two types of function one-to-one function and

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# one-to-one function means every x-coordinate has only 1 y-coordinate

# many-to-one function means some x-coordinates have only 1

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- We find the inverse function by switching x and y, then one-to-

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- We use the horizontal line to test the graph of the function has

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# graph 1

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∴ The function of graph 1 has no inverse

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∴ The function of graph 2 has inverse

# graph 3

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∴ The function of graph 3 has no inverse

# graph 4

∵ The horizontal line cuts the graph in more than 1 point

∴ The function of graph 4 has no inverse

* Only the function represented by graph 2 has an inverse function

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