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answer this simultaneous equation please. 3a-b=9 2a+2b=14

2 answers

Double the first one to get:
6a - 2b = 18
Now add the second equation,
2a + 2b = 14
and you get
8a = 32
which requires that
a = 4
Use either of the first two equations to get b.
8 + 2b = 14
Take it from there.
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