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x - 2y = 0
4x - 3y = 15

From the first equation, x = 2y.
SUBSTITUTING this value of x in the second equation,
4*(2y) - 3y = 15 ie 8y - 3y = 15 or 5y = 15 so that y = 3
and then, x = 2y gives x = 2*3 = 6

Answer: x = 6, y = 3

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Q: Solving by subsitution x - 2y equals 0 4x - 3y equals 15?
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