A straight line in the xy-plane has a slope of 2 and a y-intercept of 2. On this line, what is the x-coordinate of the point whose y-coordinate is 480 ?
Choose the correct choice from the following answers:	A) 249	B) 498	C) 239	D) 823	E) 1,002

Rationale: "slope of 2 and a y - intercept of 2 y - coordinate is 480 y = 2 x + 2 478 = 2 x x = 239 answer : c . 239"
Answer: C