Hudman57
06.10.2020 •
Mathematics
Use substitution 9x-3y=9 3x-y=3
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Ответ:
x=1
Step-by-step explanation:
3x-y=3
y=3-3x
9x-3y=9
9x-3(3-3x)=9
9x - 9 + 9x=9
9x + 9x=9 + 9
18x=18
x=18÷18
x=1
Ответ: