I have to solve this problem, but I am stucked
$$y1 = \frac{x1}{x1 + x2} $$
$$y2 = \frac{x1 +x2}{x1 + x2 +x3} $$
$$y3 = {x1 + x2 +x3} $$
How do I solve for x1, x2, and x3?
The best I coud do is
$$y2y3 = {x1 +x2} $$
In this part I am stucked, how do I get the x1?
The answer is $$x1 = {y1y2y3} $$ $$x2 = {y2y3}-{y1y2y3} $$ $$x3 = {y3}-{y2y3} $$
$$y_2 = \frac{x_1 +x_2}{x_1 + x_2 +x_3}= \frac{x_1 +x_2}{y_3}$$
$$y_1 = \frac{x_1}{x_1 + x_2}= \frac{x_1}{y_2y_3}$$