rayonnalawrence1000
05.09.2019 •
Mathematics
Physical science is
a. the study of rocks minerals and resources
b. the study of the environment and interaction between living things
c. the study of matter and energy and the relationship between matter and energy
d. a general survey of all science
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Ответ:
Since y=6, we can plug it in the second equation so it would be x+6=20 which means x=14, you can comment if anything confuses you