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{{ printedBook.courseTrack.name }} {{ printedBook.name }} To see why this answer is incorrect, let's graph both equations on the same coordinate plane.

We see that the lines are parallel but clearly not the same line. If two lines have the same slope but different $y-$intercept then they are parallel and do not intersect. Since there is no point of intersection between the lines the system has no solution. The error was thinking that two lines with the same slope are identical.