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Home > A2C > Chapter 10 > Lesson 10.2.5 > Problem 10-130

10-130.

b = cost of boards ($) p = cost of posts ($) i = cost of piers ($)
2p + 3b + 4i = 52
p + 5b = 13
3b − 4i = −34
Now, solve the system of equations using elimination.

The boards cost $2, the posts cost $3, and the piers cost $10.