Solving inequalities by graph

I have the following with 2 unknown A and K and I want to plot K and A in a graph(A vs K). Please help me with the codes

[1] K*A > 0

[2] K < 780

[3] (-15*K*A)/(52-K/15)+60+K > 0

[4] K >= 300/a

[wingwing]

Anyone please help

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

[Walter Roberson]

The solution involves two disjoint regions. The solution in negative A and negative K extends infinitely along A -> -infinity