If x=kc and y=kt,then y+2x =?  Select.
A) k(t-c)  B) k(c-t)  C) k(t+2c)  D) t(k-c)  E) k(1-t)
Just put in the given values of y and x   y +2x = kt +2 kc   Now take k common   y +2 x = k(t +2c)   You get (k(t+2c)) as your answer.
<result>C</result>
If x=kc and y=kt,then y+2x =?