pidgevoltron2008
pidgevoltron2008 pidgevoltron2008
  • 01-12-2020
  • Mathematics
contestada

If y varies directly with x, and y = 2 when x = −4, what is the value of y when x = 20 ?

Respuesta :

mussamussa611
mussamussa611 mussamussa611
  • 01-12-2020

Answer:

y=kx

2=k.-4

k=-1/2

then

y=-1/2×20

y=-10

Answer Link
jimrgrant1 jimrgrant1
  • 01-12-2020

Answer:

y = - 10

Step-by-step explanation:

Given that y varies directly with x then the equation relating them is

y = kx ← k is the constant of variation

To find k use the condition y = 2 when x = - 4, that is

2 = - 4k ( divide both sides by - 4 )

[tex]\frac{2}{-4}[/tex] = k, that is

k = - [tex]\frac{1}{2}[/tex]

y = - [tex]\frac{1}{2}[/tex] x ← equation of variation

When x = 20, then

y = - [tex]\frac{1}{2}[/tex] × 20 = - 10

Answer Link

Otras preguntas

Can someone give me feedback on my thesis statement? Advancements in genetic engineering such as designer babies have impacted people lives such as getting rid
the revenue for the school play is given by: r=-50t^2 + 300t, where “t” is ticket price in dollars. The cost to produce the play is given by: C=600-50t. Determi
Express 20% as a fraction in its lowest form? Thanks
The length of a rectangle is 3 centimeters more than 3 times the width. If the perimeter of the rectangle is 46 centimeters, find the dimensions of the rectangl
Can someone plz help me with this biology question, I don't understand it
What is the length of jh
(40)points to answer this question
How do Complex Civilizations find food in there time period?
Can you plz help me with this problem I’ve been stuck on it for a long time
Solve: 2 3 x - 4 = -2 A) -3 B) -4 C) -9 D) 3