SOLUTION: I need help with AB = 4x+9 BC= 5x+2 AC = 56 solve for x

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Question 906100: I need help with AB = 4x+9 BC= 5x+2 AC = 56 solve for x
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Assuming A, B and C are all on the same line with B between A and C, we can say


AB + BC = AC

4x+9 + 5x+2 = 56

9x + 11 = 56

9x = 56 - 11

9x = 45

x = 45/9

x = 5

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Extra Info: We can use x = 5 to find AB and BC

AB = 4x+9
AB = 4(5)+9
AB = 20+9
AB = 29

BC = 5x+2
BC = 5(5)+2
BC = 25+2
BC = 27

Notice how AB = 29 and BC = 27 add to AC = 56 (AB+BC = 29+27 = 56 = AC). That confirms our answer.