To graph a line you only need two points that lie on it,so take two convenient values for x and plug it into the equation to get the corresponding y for each case.For example:
if x=0 :
0 = 3y
y=0/3
y=0
Therefore,the first point on the line is (0,0)
if x=1:
1=3y
y=1/3
Therefore,the second point on the line is (1,1/3)
The line that passes between these two points is the graph of x=3y
