isaacchan
15.01.2020 •
Mathematics
How to solve equations
3y-2x=11
y+2x=9
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Ответ:
y+2x=9
just plus them
4y = 20
y = 5
put y = 5 in y+2x=9
5 + 2x = 9
2x = 9 - 5
2x = 4
x = 2
thus x = 2
y = 5
Ответ:
V cylinder = 100 x 3.14 x 30^2 = 282,600
=» V water = 282,600 - 7,235 = 275,365