keshjdjsjs
20.08.2019 •
Mathematics
My teacher gave me a sheet of this and no instructions:
1. 5x+2y=10
-5x+7y=8
i don't know what i am suppose to do.
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Ответ:
add the two equations together
5x-5x+2y+7y=10+8
9y=18
divide both sdies by 9
y=2
subsitute into first equation
5x+2(2)=10
5x+4=10
subtract 4 from both sides
5x=6
divide both sdies by 5
x=6/5
so the asnwer is x=6/5 and y=2
Ответ:
a.. He created a way of naming organisms based on genus and species.
Explanation: