If y varies directly with x and y= 6 and x= -3, find y when x= 4?

Question

If y varies directly with x and y= 6 and x= -3, find y when x= 4?

Answer 1

x = -3

and y = 6.

so, x/y = -3/6 = -1/2

now, y = ? when x = 4.

As x varies with y directly,

x/y = -1/2

or 4/y = -1/2

or -y = 4 * 2 (by crossmultiplication)

or y = -( 4*2 )

or y = -8 (ANSWER)

Answer 2

y=kx

6=k(-3)

6=-3k

k=-2

y=(-2)(4)

y=-8

im not sure.. but thats will be my answer!!

^_^

Answer 3

L.H.S

y=kx

6=k(-3)

6=-3k

k=-2

R.H.S

y=(-2)(4)

y="-8"

ANSWER IS    " -8 "

Answer 4

So if y varies directly with x , then the equation comes to,

y= k*x.......where k is a constant,..........(1)

when y=6 and x=-3 then

solving equation  1 we get

k= -2;

now when x=4,then substituting the value of k in eq1

we get,

y= -2 * 4

= -8 (ANSWER)

Answer 5

"ans is  13" as on solving the eqn it is found that y=9+x