3/5 + 5/7 = 1 11/35 - 1/5 = 1 4/35 which is your final answer.
The unit rate is 2/3 because in the line y=2/3x, 2/3 is the slope (y=mx+b). The slope of the line is pretty much the definition of a unit rate because the unit rate is a constant addition or subtraction over and over. In addition, it is a straight line(y=mx+b) and the values are going up at a constant rate of 2/3.
You add up all of the values on both ends of the table
