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Korvikt [17]
3 years ago
10

If x+y=5,x-y=4,find the value of x²-y²​

Mathematics
1 answer:
inysia [295]3 years ago
4 0

Answer:

20

Step-by-step explanation:

→ First find the value of x and y

x + y = 5

x - y = 4

→ Add the equations to cancel out the y's

2x = 9

→ Divide both sides by 2 to find the value of x

x = 4.5

→ Substitute x = 4.5 back into x - y = 4 to find the value of y

4.5 - y = 4

→ Minus 4.5 from both sides to isolate -y

-y = -0.5

→ Multiply everything by -1

y = 0.5

→ Substitute x = 4.5 and y = 0.5 into x² - y²

4.5² - 0.5² = 20.25 - 0.25 = 20

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3 years ago
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Answer:

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Step-by-step explanation:

Remember how we define the absolute value of a number.

(a)

In general

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(b)

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(c)

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8 0
3 years ago
There are 40 students in a class. Three-fifths (1/5) of the students are boys.
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Answer:

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Step-by-step explanation:

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Read 2 more answers
If 5 miles is 8 kilometers, which of the following is correct? A. 47.5 miles is 76 kilometers B. 52.5 miles is 86 kilometers C.
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Step-by-step explanation:

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