felicityhanson1252

26.08.2019 • 

Mathematics

1. suppose y varies directly with x, and y = 14 when x = –4. what is the value of y when x = –6?
–21
10
18
21
2. suppose y varies directly with x, and y = 25 when x = 140. what is the value of x when y = 36?
140
165
201.6
176
3. the point (12, 9) is included in a direct variation. what is the constant of variation?
one half
three fourths
1
2

Ответ:

Jordan0423

01.01.2022

Mathematics

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1) y varies directly with x, then we have: y = kx,  k is the constant of variation 

y = kx

14 = - 4k
k = 14/- 4, or - 7/2, or - 3.5 

y = kx
y = - 3.5(- 6) 
y=21

2) 201.6 is the right answer.see the procedure used in Q1.

3) K = y/x
        = 9/12
        = 3/4

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Ответ:

katherineweightman

21.01.2020

Mathematics

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Let's call the distance between the moon and sun as z. The scientist can calculate the numerical value of sin x° and then write sin x° as y / z. They can then set the numerical value of sin x° equal to y / z and then solve for z.

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