21=u+a3.5 33=u+a6.5

find u and a thanks
in Pre-Algebra Answers by Level 1 User (220 points)

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1 Answer

line 1: u+3.5a=21

line 2: u+6.5a=33

subtrakt line 1 from line 2...3a=33-21=12

a=12/3=4

put this in line 1...u+14=21

u=21-14=7
by

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