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Through the mathematical equation of fixed point
① When the intercept of a straight line on two axes is 0, let the equation of straight line L be: y=kx.

Substituting the point p (2 2,3) into the equation, we get: 3=2k, that is, k=3/2.

∴ The equation of line L is 3x-2y = 0;;

② When the intercept of a straight line on two coordinate axes is not 0, let the equation of straight line L be: x/a+y/a= 1.

Substituting the point p (2 2,3) into the equation gives 2/a+3/a= 1, that is, a=5.

The equation of the straight line l is: x+y-5 = 0.