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dusya [7]
3 years ago
11

Solve. 3 b=-a a + b = 21

Mathematics
1 answer:
Eva8 [605]3 years ago
4 0

Answer: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

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