Eli saves money each month to buy a new computer. He kept track of his progress in the following table and a graph that he drew. How much does Eli add to his savings each month and how does this appear on this graph? A He saves $60 per month and this is the slope of his graph. B He saves $83 per month and this is the y-intercept of his graph. C He saves $30 per month and this is the slope of his graph. D He saves $30 per month and thus is the y-intercept of his graph.