In the equation 2x â€“ cy = 18, c is a constant. If the value of y is 2 when x is 6, what is the value of x when y is 4 ? Choose the correct choice from the following answers.
A) âˆ’9/2  B) -4  C) 3  D) 4  E) 9/2
2x - cy = 18   x=6, y=2;   12-2c=18   c=-3   2x-cy=18   when y=4, c=-3, x=   x=3   ANSWER:3
<result>C</result>
In the equation 2x â€“ cy = 18, c is a constant. If the value of y is 2 when x is 6, what is the value of x when y is 4 ?