[tex]\displaystyle 1)\left \{ {{x+3y=4} \atop {5x+3y=32}} \right. \\\\\left \{ {{3y=4-x} \atop {5x+3y=32}} \right. \\\\5x+4-x=32\\x=7\\5*7+3y=32\\y=-1\\(x,y)=(7,-1)\\\\2)\left \{ {{5x-3y=21} \atop {8x+3y=18}} \right. \\\\(5x-3y)+(8x+3y)=21+18\\13x=39\\x=3\\5*3-3y=21\\y=-2\\(x,y)=(3,-2)[/tex]
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[tex]\displaystyle 1)\left \{ {{x+3y=4} \atop {5x+3y=32}} \right. \\\\\left \{ {{3y=4-x} \atop {5x+3y=32}} \right. \\\\5x+4-x=32\\x=7\\5*7+3y=32\\y=-1\\(x,y)=(7,-1)\\\\2)\left \{ {{5x-3y=21} \atop {8x+3y=18}} \right. \\\\(5x-3y)+(8x+3y)=21+18\\13x=39\\x=3\\5*3-3y=21\\y=-2\\(x,y)=(3,-2)[/tex]