If you are given the parallel sides of a trapezoid contained by the lines y = 2x + 7 and y = 2x - 4, yo need to draw them or graph them on a paper or use excel. You will find that the lines are linear and are parallel to eacher by a distance of 11. The equation that represents the line contained by the midsegment is y = x + 2. The answer is letter B. Among the choices, only this line is between the given lines.
