You can
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5x + 6y = 3
-25x - 30y = 6
If you try to solve the system by multiplying the first
equation through by 5 you get
25x + 30y = 15
-25x - 30y = 6
Then when you add the equations vertically term by term:
25x + 30y = 15
-25x - 30y = 6
---------------
0y = 21
And there can be no possible value for y, because there is
no value for y that you can multiply by 0 and get 21, because
you'll always get 0 instead.
So the system has no solution because the system is inconsistent.
That is if you draw their graphs, they do not intersect to give
a solution because they are parallel. Here are their graphs:
Edwin