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3 years ago

Y varies directly with x. If y=25 when x=5, find y when x =-4y =

Mathematics

1 answer:

alina1380 [7]3 years ago

7 0

Answer:

y = -20

Step-by-step explanation:

Given that y varies directly with x it means changing x will also cause change in y

Mathematically it can be written as:

y∝x

Removing the proportionality symbol

y = kx

Given y=25 when x=5 Putting the values

$25 = k(5)\\k = \frac{25}{5}\\k = 5$

Now

$y = 5x$

We have to find the value of y when x = -4

Putting x=-4

$y = 5(-4)\\y = -20$

Hence,,

y = -20

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3 years ago

Does anyone know how to do this?

sineoko [7]

Answer:

$\boxed{\tt x=\sqrt{85} }$

Step-by-step explanation:

When making a right triangle with 2 points, the distance is the hypotenuse which can be represent as "x"

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$\boxed{{\tt a^2+b^2=c^2}}$

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Let's Plug in the side lengths:

$\tt 9^2+2^2=x^2$

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$\tt 81+4=x^2$

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Take the square root of both sides:

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3 years ago

a rhombus as an area of 72 ft and the product of the diagonals is 144. What is the length of each diagonal?

SashulF [63]

A = (1/2)(x)(y)

Let x = diagonal 1

Let y = diagonal 2

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This means that x = 12 and y = 12.

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Prove:

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wolverine [178]

Answer:

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Step-by-step explanation:

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Y varies directly with x. If y=25 when x=5, find y when x =-4y =​

Y varies directly with x. If y=25 when x=5, find y when x =-4y =