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So far, it is known that the following it true:

y = 4x + 2y = 5x

To make the search for the solution easier, I'll assume that this is based on two different equations:

y = 4x + 2y

and

y = 5x

The first equation can be simplified like so:

y - y = 4x + 2y - y

0 = 4x + y

y = -4x

If you use substitution, the fact that y must equal either -4 times a number or 5 times a number can be used to find the following:

5x = -4x

5x + 4x = 0

9x = 0

x = 0

The only answer to this problem is x = 0 (zero).

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Q: Y equals 4x plus 2 y equals 5x using substitution?
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