B is between A and C. AB=2x+5, BC=5x-12, AC=28.find BC

i dont know how to slove it and get the awnser.
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1 Answer

line from a tu c with b in tween,

so bc=ac-ab

bc=28-(2x+5)=5x-12

28 -2x-5 -5x+12=0

-7x=-28+5 -12=5-40

-7x=-35

x=35/7=5

bc=5x-12=25-12=13
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