Ответ(ы) на вопрос:
Гость2X - 2Y - 7X = 13 - 5X - 2Y = 13 ////////////////////// 15X + 3X + 3Y = - 9 18X + 3Y = - 9 //////////////////// 13X + Y = 4 Y = 4 - 13X //////////////////// 18X + 3*(4 -1 3X) = - 9 18X + 12 - 39X = - 9 - 21X = - 21 X = 1 ///////////////// Y = 4 - 13 = - 9
Гость2(x-y)-7x=13 15x+3(x+y)=-9 2(x-y)-7x=13 y=-2.5x-6.5
15x+3(x+y)=-9 15x+3(x+(-2.5x-6.5))=-9 15x-4.5x-19.5+9=0 10.5x-10.5=0 x=10.5/10.5 x=1
2(x-y)-7x=13
2(1-y)-7*1=13 3. -18-2y=0 y=-18/2 y=-9
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