If AB = x + 10 and AC = 3x + 10, find BC.

Answer 1

If AB = x + 10 and AC = 3x + 10, find BC.

Hello Shaniya,

If Line AB = x + 10, and Line AC = 3x + 10. It appears that Line AC has 2x's more than Line AB, that conclusion was made by simple observation. But, let's do the math and see if that is true.

A___________________B . line AB = x + 10

A________________________________C . line AC = 3x + 10

To find BC, subtract AB from AC:

AC - AB =

3x + 10 - (x + 10) = ..... * Hint: be sure to put line AB in parenthesis to distribute the minus sign.

3x + 10 - x - 10 =

2x = Line BC