Question

I WILL MEDAL AND FAN! :)
Which is the direct linear equation for the relationship?
Y varies directly with x and y=12 when x=3
a: y=4x
b: y=1/4 x
c: y= x+9
d: y= x-9

Answer 1

@ganeshie8

Answer 2

@mathstudent55

Answer 3

@dan815

Answer 4

y varies directly with x
looks like y=kx
find k using (x,y)=(3,12)

Answer 5

k=6

Answer 6

so you say saying 12=6(3)
that is impossibly

Answer 7

no sorry I was dividing

Answer 8

well you should be able to get the correct k by dividing
you have 12=k*3
how do you solve for k

Answer 9

you said 6 which is impossible because 3(6)=18 not 12

Answer 10

so its 4?

Answer 11

so that makes it A correct?

Answer 12

it would be A or C

Answer 13

it would be A since y=kx is a direct variation
and we want to find k given y=12 and x=3
12=3k
dividing 3 on both sides
12/3=k
4=k

so that means instead of y=kx you write y=4x since you found k to be 4