To find the x-intercept, plug in y=0: 6x=30, x=5 so x-intercept is (5,0). That's 5 on the x-axis.
To find the y-intercept, plug in x=0: 5y=30, y=6 so y-intercept is (0,6). That's 6 on the y-axis.
Draw a line through the intercepts to make the straight line graph.