Basically, we are trying to find the equation that goes through the two points shown in the table. The points are: (5,30) and (10,55). The equation of a line is y=my+b where m is the slope and b is the y intercept. To find slope look for the change in y over the change in x.
Slope = (55-30)/(10-5)=5
We can stop here because the only answer choice with a slope of five is choice A.
