Here's the question you clicked on:
kristin
the ages of two brothers are in the ratio two to three,but in eight years the ratio of ther ages will be three to four .findtheir presentage
hmmmm, so you want to turn this into a series of equations based on the rules outlined in the word problem. and then solve them.
so how can you write one of the equations given the first piece of information?
where y = younger, and x = older
but since there are two variables in this problem, you need a second equation to solve
(the two present ages are the two variables)
so we know in 8 years, that the ratio will actually be 3/4, not 2/3
now that you have two unknown variables (the present ages), and two equations, you can solve the problem by substituting the first (y=2x/3) into the second.