By counting grid squares or finding the difference of horizontal and vertical coordinates, you can determine that the rectangle is 2 units wide by 9 units tall. The area is the product of these dimensions:
If two lines are parallel to one another, then their slopes are identical. The slope in the line above is 3/4. Therefore, a line parallel to that line will also have a slope of 3/4, it will just have a different y-intercept.
