2x – 3y = –5 (B) 2x 5y = –11 ;Hints You could calculate P(XY=3) =P(X=0,Y=3)P(X=1,Y=2)P(X=2,Y=1)P(X=3,Y=0) Since X and Y are independent P(X=x,Y=y)=P(X=x)P(Y=y)Solve the system by graphing x y = 3 x y = 1 The idea is to graph both lines and find the point where they cross, or intersect Get three points on the first line x y = 3 Pick an arbitrary value for x
Example 12 Solve X Y 5 X Y 3 Graphically Examples