Since it's to the left, and not up or down at all, the y-value does not change. The x-value, however, <em>is</em> affected. Since it's to the left, it is decreasing in value by 2 points. If it were to the right, it would increase in value to (7,3), since it'd be going further away from (0,0).
To use the equation we need a1 and d(the common difference). We have a1 = 57, we need to find d. 93-84 = 9; 84-75=9; 75-66=9; 66-57=9 d = 9 a350 = 57 + (350-1)(9) a350 = 57 + (349)(9) a350 = 57 + 3141 a350 = 3198
