What is the ratio of x to y?
3/2=2x/2x+y
a. -3/2
b. -2/3
c. 2/3
d. 3/2

From any proportion, we get another proportion by inverting the extremes (or the means):

= k

so we have:

2x=3k
2x+y=2k therefore:
3k+y=2k
y= - k

x=

= -

The corect answer is A. -3/2

or:



From any proportion, we get another proportion by inverting the extremes and the means:



We use a property of proportions:

  where a, d are extremes and b,c are means and the product of the extremes equals the product of the means (a*d=b*c),

so we have

  or

  (you can check this also by "the product of the extremes equals the product of the means")







3y = - 2x