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3 years ago

Plz help please and thank you

Mathematics

1 answer:

Ivanshal [37]3 years ago

4 0

Answer:

(5,-3)

Step-by-step explanation:

9x+2y=39

6x+13y=-9

---------------

117x+26y=507

12x+26y=-18

----------------------

105x=525

x=5

Substitution

9(5)+2y=39

45+2y=39

2y=-6

y=-3

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klemol [59]

Answer:

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Part 2) $f(x)=\frac{x}{x+4}$ ----> $x\neq -4$

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Step-by-step explanation:

we know that

The domain of a function is the set of all possible values of x

Part 1) we have

$f(x)=\frac{x+4}{x}$

we know that

In a quotient the denominator cannot be equal to zero

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Part 2) we have

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This is a vertical parabola open upward

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$f(x)=\frac{4}{x^2+8x+16}$

we know that

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Equate the denominator to zero

$x^2+8x+16=0$

Remember that

$x^2+8x+16=(x+4)^2$

( $x+4)^2=0$

The solution is x=-4

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$x\neq -4$

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