3x = 6y - 6
x = 2y - 2
4 ( 2y - 2 ) = 4 + 5 ( 2y - 2 )
8y - 8 = 4 + 10y - 10
2y = - 2
y = - 1
x = 2 ( - 1 ) - 2
x = - 4
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Answer:

Step-by-step explanation:
AC is the geometric mean. Solve it using this proportion:

Now fill in the values we know:

Cross multiply to get

That means that
AC =
, which, in decimal form is
AC = 11.40175425