Mathematics, 06.03.2020 03:37, Thnut236

Assume that y varies inversely with x. If y=7 when x=-2, find y when x=7.

Answers: 2

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answered: Guest

step-by-step explanation:

30% of $420 is 0.30($420) = $126 and $420 + $126 = $546.

or, 130% of $420 is 1.3($420) = $546.

notice that this is not the $600 original list price with which we started.

why doesn't this work?

the method does not work because 30% of $420 is not the same amount as the 30% of $600. it may seem obvious when stated this way, but it is a very common error made on problems of this type. we cannot just use the same percent and get back to the original amount because we are taking that percent of a different value.

to work problems of this type correctly, it is generally best to write an equation for the situation and then solve.

example: since (100% – 30%)(original price) = (sale price)

70% of the (original price) is $420.

0.7x = 420

equation image indicator

x = 600

the original cost was $600.

we may also solve this problem using the two-step method. working the problem in two steps requires us to use more algebra skills. we have to know that x = 1x (identity property of multiplicationtext annotation indicator) and that 1x – 0.3x = 0.7x (subtracting like terms). then we solve the problem as follows:

(original price) – 30%(original price) = sale price

x – 0.3x = 420

0.7x = $420

equation image indicator

x = 600

the original cost was $600.

note that with both of the above methods we do obtain the correct original amount.

example: after a 5% pay raise, hermione is earning $22,680 per year. what was she earning before the pay raise?

105% of (original salary) = current salary

1.05x = 22,680

equation image indicator

x = 21,600

hermione earned $21,600 per year before the pay raise.

this is an example so maybe you will get how to at least do it!

answered: Guest

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answered: Guest

No i refuse to tell you the answer but the estimate is 10

answered: Guest

vertical asymptote $x=3$ .

horizontal asymptote $y=-1$ .

step-by-step explanation:

given function is $f\left(x\right)=\frac{-3x-5}{3x-9}$ .

vertical asymptote is given by setting

denominator =0

$3x-9=0$

$3x=9$

$x=\frac{9}{3}$

$x=3$

when degree of numerator and denominator are same then divide first term of numerator by first term of denominator to get horizontal asymptote.

$y=\frac{-3x}{3x}$

$y=-1$

Graph all vertical and horizontal asymptotes of the function. f(x)= -3x-5 3x-9 if anyone can it’d

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Assume that y varies inversely with x. If y=7 when x=-2, find y when x=7....