Sinem's utility function is U(x,y) = min{6x,4x +y}. The price Ofx is $3 and the price of y is $1. Sinem's income offer curve is O a line parallel to the y axis. 0 a line parallel to the x axis. 0 the same as his Engel curve for x. O a ray from the origin with a slope of 4. O a ray from the origin with a slope of 1/4