prettyluhangel
01.07.2021 •
Mathematics
Y’all m still in school it’s summer
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Ответ:
7a+4b=12
you substitute 4 in for 7a because it tells you in the first equation that 7a=4
4+4b=12
next you subtract 4 from each side
4b=8
next you divide 4 from each side
b=2
and theres your answer