laytonlutz
10.11.2020 •
Mathematics
Solve.
3
b=-a
a + b = 21
Solved
Show answers
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Ответ:
b=-10.5, a=31.5
Step-by-step explanation: 3b=-a , -3b=a
a+b =21
-3b+b = 21
-2b=21
b=-10.5
a=-3b
a=-3*-10.5=31.5
Ответ:
80cm
Step-by-step explanation: