Question

Solving a word problem using a 3x3 system of linear equations: Problem...

Tammy, Michael, and Bill have a total of $123 in their wallets. Bill has 4 times what Micheal had. Micheal had $9 more than Tammy. How much do they have in
their wallets?

Answer 1

t + m + b = $123

b = 4m

m = t + $9

m - $9 + m + 4m = $123

6m = $132

m = $22, b = $88, t = $13

Tammy has $13, Michael has $22, and Bill has $88.