What is 3y=-6+4 2x+y=9 in linear equation

The first one is already in slope intercept the other one is y=-2x+9

The major difference is that a histogram is only used to plot the frequency of score occurrences in a continuous data set that has been divided into classes, called bins.  bar charts, on the other hand, can be used for a great deal of other types ofvariables  including  ordinal  andnominal  data sets.