The variables x and y vary directly. Given x = 5 and y = 3, write an equation that relates the variables and find y when x = 2.

A.y = 15x; y = 30
B.y = 5/3 x; y = 10/3
C.y= 0.6x; x = 1.2
D.y = 15/x; y = 7.5

Question

The variables x and y vary directly. Given x = 5 and y = 3, write an equation that relates the variables and find y when x = 2.

		A.y = 15x; y = 30
		B.y = 5/3 x; y = 10/3
		C.y= 0.6x; x = 1.2
		D.y = 15/x; y = 7.5

anonymous · Answer

directly vary means y=kx

now y=3  x=5

3/5=k

equation

y=(3/5)*x

y=6/5   when x=2

C 

is the  answer

anonymous · Answer

3/5=.6

y=.6x

5/6=1.2

1.2=x