<prompt> Grafu za vitendaji viwili vya mstari, fx na gx, vinaonyeshwa hapa kwenye seti moja ya shoka: asyukubwa 150;ticklen halisi3;nafasi halisi ya tiki2;urefu halisi 0.1cm;saizi halisi ya mshale0.14cm;mhimili wa kalamunyeusi1.3bp;vectorarrowsize halisi0.2cm;tickdown halisi-0.5;tickdownlength halisi-0.15inch;halisi tickdownbase0.3;tickdown halisitickdown;utupu rr_cartesian_axesxleft halisi, xright halisi, ybottom halisi, ytop halisi, xstep1, ystep1, bool useticksfalse, bool complexplanefalse, bool usegridtrue kuagiza grafu;mimi halisi;ikiwacomplexplane lebotextnormalRe,xright,0,SE;lebotextnormalIm,0,ytop,NW; nyengine lebox,xright0.4,-0.5;leboy,-0.5,ytop0.2;ylimitsybottom,ytop;xlimits xleft, xright;halisi TicksArrx,TicksArry;kwaixleftxstep; i0.1 TicksArrx.pushi;kwaiybottomystep; i0.1 TicksArry.sukumai;ikiwa tumia gridi xaxisBottomTopextendfalse, Ticks, TicksArrx ,pTickgray0.22,extendtrue,pisiyoonekana;,juukweli;yaxisLeftRightextendfalse,Ticks, TicksArry ,pTickgray0.22,extendtrue, pinvisible;,mishale;ikiwa vijiti vya matumizi xequals0, yminybottom, ymaxytop, paxispen, Ticks,TicksArry , pTickblack0.8bp,Sizeticklength, juukweli, Mishalesizeaxisarrowsize;yequals0, xminxleft, xmaxxright, paxispen, Ticks,TicksArrx , pTickblack0.8bp,Sizeticklength, juukweli, Mishalesizeaxisarrowsize; nyengine xequals0, yminybottom, ymaxytop, pmhimili, juukweli, Mishaleukubwaaxisarrowsize;yequals0, xminxleft, xmaxxright, paxispen, juukweli, Mishalesizeaxisarrowsize;;rr_cartesian_axes-5,5,-5,5;f halisi x halisi kurudi 4-x2;g halisi x halisi kurudi 2x-4;choragraphf,-5,5,operator .., blue1.25;choragrafug,-12,92,opereta .., chungwa1.25;chora-3,-6---1,-6,bluu1.25; leboyfx,-1,-6,E;chora-3,-7---1,-7, chungwa1.25; leboygx,-1,-7,E;asy Kila kisanduku dogo katika gridi ya taifa ni 1 kwa 1 unit.Tathmini fg1cdot gf1.  <response>: Pointi 1,-2 iko kwenye grafu ya ygx, na pointi -2,3 iko kwenye grafu ya yfx, kwa hivyo fg1 f-2 3. Pointi 1,1.5 iko kwenye grafu ya yfx, na uhakika 1.5, -1 iko kwenye grafu ya ygx, kwa hivyo gf1 g1.5 -1. Hivyo, fg1 cdot gf1 3-1 -3. 