Question

Which equation represents a direct linear variation?
A.y=x^2
B.y=x+3
C.y=2/5x
D.y=1/x

Answer 1

well, for a direct linear variation, the equation must be in the form y = kx, where k can be any number

Answer 2

x cannot be in the denominator, and x cannot have an exponent other than 1

Answer 3

nothing can be added or subtracted to x

Answer 4

So that means its A right?

Answer 5

nope, try again...

Answer 6

x cannot have an exponent other than 1

Answer 7

well its not B right since that one is addition

Answer 8

right, keep going

Answer 9

is it d?

Answer 10

nope, remember that x cannot be in the denominator

Answer 11

Oh duh. So its C :D

Answer 12

y = kx
y = (2/5)x

see how these equations are similar?

Answer 13

yes C

Answer 14

Yes i see that now, thank you for taking the time to help me :)