Question

if y varies directly as x and y=2/3 when x=1/2, find an equation of direct variation
the choices are:
a. y=3/4x
b. y=-4/3x
c. y=4/3x
d. y=-3/4x

Answer 1

So y=kx
And you know y=2/3 and x=1/2
So
2/3= k(1/2)
Can you find k?

Answer 2

no >.<

Answer 3

well i just continue from nikato.
2/3 = k * 1/2
times 2 on both sides, get
2/3 * 2 = k * 1/2 * 2
4/3 = k

now plug in that k = 4/3 into equation of y=kx