The following graph shows the relationship between a person's weekly salt intake and his or her systolic blood pressure. 2200 4600 7000 9400 11800 14200 125 120 115 110 105 100 (Millimeters of mercury) (Milligrams) What is wrong with this graph? It gives no information about the units for the variables. It doesn't label the variables on the two axes. It uses different scales on the two axes. It has no data