vaelriacb9300
22.06.2019 •
Mathematics
What is the solution of 3x+3y+6z=9 x+3y+2z=5 3x+12y+12z=18
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Ответ:
C
Step-by-step explanation:
multiply through by 10
10{4.8(x-4)} = 10(-0.2x) + 10(15.8)
48(x-4) = -2x + 158
48x - 192 = -2x +158
48x + 2x = 158 + 192
50x = 350
divide through by 50
x=350/50
x=7
therefore, answer = C