KIKIClay151
16.12.2020 •
Mathematics
Select all the expressions that are equivalent to 24n + 16. *
2 points
A) 8(n + 2 + 3n)
B) 23n + 4 + 12 + 0 + n
C) 12(12n + 4)
D) 8(2 + 3n)
E) 8n + 22 + 12 + 16n
F) 8 + 8 + 8n + 8n + 8n
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Ответ:
4x+7y=-30
-x=18+7y
x=18-7y
4(18-7y)+7y=-30
72-28y+7y=-30
72-21y=-30
21y=72-(-30)
21y=72+30
21y=102
y=102/21=34/7
Since x=18-7y,
x=18-7(34/7)
x=18-34=-16.
x=-16, y=34/7. (-16, 34/7).