Question

Which equations show direct variation between a and b?

Choose all answers that are correct.

A.b=0.7a


B.b=1/8a-3


C.5(1/a)=b


D. 1a=b

Answer 1

2 fans

Answer 2

First, please explain as best y ou can what "direct variation" means. If you get that right, it should be easy to choose the correct answer.

Answer 3

i dont know

Answer 4

fast

Answer 5

Mind looking it up on Google? just type in "direct variation"

Answer 6

their relationship is called a direct variation. It is said that one variable "varies directly" as the other. The constant ratio is called the constant of variation.

Answer 7

Yes, so if x on the right side increases, y on the left side increases with it, and the constant k is called the proportionality constant.

y=kx.

That's the model for direct variation.
Now look at your answer choices again.

Answer 8

b=0.7a When a increases, does b also increase? or does b decrease?

Answer 9

no

Answer 10

Why do you believe b does not increase when a increases?

Answer 11

oh is a increase it does

Answer 12

so a,d

Answer 13

b=0.7a represents direct proportion, yes. Very good.

Answer 14

k

Answer 15

Welcome to OpenStudy!

Answer 16

Variable y varies directly with variable x, and y = 9 when x = 5.

What is the constant of variation in decimal form?

Answer 17

2

Answer 18

problem