Question 309347
Solve using substitution method. 
a - 2b = 3 
3a = 6b + 9
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Rearrange:
a = 2b+3
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Substitute for "a" and solve for "b":
2b+3 = 6b+9
4b = -6
b = -3/2
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Since a = 2b+3, a = 2(-3/2)+3 = 0
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Cheers,
Stan H.