7.* 1 point which of the following represents lagrange's linear equation? (a) p+q=rr b) pp+qqfr ptq=r ) pp+qgfp+q o a o b o od 27.* 1 point stationary point is

7.* 1 point Which of the following represents Lagrange's linear equation? (a) P+Q=RR b) Pp+QqFR ptq=R ) Pp+QgFP+Q O a O b O Od 27.* 1 point Stationary point is a point where, function f{x.y) have? (a) ofox=0 )otox= 0 & otoy =0 (b) ofoy = 0 (d) ofox 0 and ofoy> 0 O a O b Oc O d