X+ y = -9
x+ 2y = -25
what is the value of x? ?

There is no graph but what i can say is that 1 is the slope and that -2 is the y- intercept

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.