Question 417306
7x-8y=-48
8y=7x+48
y=(7x/8)+6......1

8y-7x= 48
8y=7x+48
y=(7x/8)+6......2

Both lines are same.
If two lines have the same slope (ie are parallel) and the same y-intercept, they are actually the same exact line. In other words, systems have infinite solutions when the two lines are the same line! 

{{{graph(300,300,-5,5,-5,5,y=(7x/8)+6),y=(7x/8)+6))}}}