Question 843207
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Hi,
Let x and y represent the cost of the post and panels respectively:
Question states***
 5x + 5y = 122
 5x + 10y = 230

- 5x - 5y = -122    \multiplying 1st EQ by -1 and adding to the 2nd EQ to eliminate x
 <u>5x + 10y = 230</u>
        5y = 108
         y = $21.60 is the cost of a panel
and  5x + 10(21.60) = 230
           5x = 14
            x = $2.80  is the cost of each post
How much are 4 fence post and 3 fence panels?
    4($2.50) + 3($21.60)