Question

ПЛИИИИИЗЗ!!ПРОШУУ   Фото в приложении)Выполнить методом сложения

Answer 1

$left { {{x+4y=39} atop {2x-y=15}} right. left { {{x=39-4y} atop {78-8y-y=15}} right. left { {x=39-4y} atop {-9y=-63}} right. left { {{x=39-28} atop {y=7}} right. left { {{x=11} atop {y=7}} right.$$left { {{5x+y=20} atop {2x-y=1}} right left { {{y=20-5x} atop {2x-20+5x=1}} right. left { {{y=20-5x} atop {7x=21}} right. left { {{y=20-15} atop {x=3}} right. left { {{y=5} atop {x=3}} right.$

$left { {{2x+3y=2} atop {-2x+5y=-18right. left { {{2x=2-3y} atop {-2+3y+5y=-18}} right. left { {{2x=2-3y} atop {8y=-16}} right. left { {{x= frac{2+6}{2}} atop {y=-2}} right. left { {{x=4} atop {y=-2}} right.$

$left { {{2x-3y=9} atop {4x+3y=27}} right. left { {{2x-3y=9} atop {3y=27-4x}} right. left { {{2x-27+4x=9} atop {3y=27-4x}} right. left { {{6x=36} atop {3y=27-4x}} right. left { {{x=6} atop {y= frac{27-24}{3} }} right. left { {{x=6} atop {y=1}} right.$

$left { {{x+4y=39} atop {2x-y=15}} right. left { {{x=39-4y} atop {78-8y-y=15}} right. left { {{x=39-4y} atop {-9y=-63}} right. left { {{x=39-28} atop {y=7}} right. left { {{x=11} atop {y=7}} right.$