The teacher wants us to do the following problem by using substitution. I don't think I am doing it right.

4x - 12y =5
-x + 3y = -1

Those two equations are for parallel lines that never intersect. There is no solution.

If you substitute 3y +1 for x in the first equation, you will be led to an equation that cannot be valid, stating that two different constants are equal.

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