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3x - 2y = 20

Substitute x = 4y into this equation: 3(4y) - 2y = 20

ie 12y - 2y = 20

10y = 20

so that y = 2

and then x = 4y gives x = 2*4 = 8

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Q: Solve this equation using subtitution x equals 4y and 3x-2y equals 20?
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