In a proportional relationship, how can you determine the unit rate while looking at the graph?

The unit rate is the slope of the line.
To find the slope from a graph, do this.
Find the x- and y-coordinates of two points.
Subtract the y-coordinates.
Subtract the x coordinates in the same order.
Divide the first difference by the second difference.
That is the slope and the unit rate.

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.