geometry

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If B is between A and C, AB=5y+4, BC=7y-3, and AC=20y-7. Find the value of y, AB, BC, and AC.

• geometry -

after making a diagram
it is clear that

20y-7 = 5y+4 + 7y-3

solve this for y, then sub it into the expressions given.

check: you should get 13 for AC

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