The value of y is directly proportional to the value of x. if y=35 when x=140, what is the value of y when x=70

Y = kx, where k is the constant of proportionality.

We need to find k as our first step.

35 = k140

35/140 = k

1/4 = k

We can now find y when x = 70.

y = kx

y = (1/4) (70)

y = 70/4

This fraction can be simplified or reduced more.

The number 2 is the GCF of 70 and 4.

70 : 2 = 35

4 : 2 = 2

Answer:

y = 35/2