If x = 2y/3 and y = 18, what is the value of 2x - 3?

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If x = 2y/3 and y = 18, what is the value of 2x - 3?

A) 21
B) 15
C) 12
D) 10

Substitute the values into the equation:
2(2y/3) - 3 <-- Given x = 2y/3

Simplifying, we have:
4y/3 - 3

Now substitute y = 18 into this:
4(18)/3 - 3
4(6) - 3
24 - 3
21 or Answer A