Question 159367
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Rewriting:
{{{x=y/(y+4)}}}
cross multiply above eqn and becomes {{{system(y=x(y+4),y=xy+4x)}}}
combine terms with variable y ------> {{{y-xy=4x}}}
factor left term -------------------> {{{y(1-x)=4x}}}
divide both eqns. by {{{1-x}}} to isolate y on the left:
{{{y(cross(1-x))/cross(1-x)=4x/(1-x)}}}
{{{y=4x/(1-x)}}} -----------------------------> FINAL ANSWER
Thank you,
Jojo</pre>