5m Zen
2x y 6 4x 2y 4 by substitution
2x y 6 4x 2y 4 by substitution pictures 5
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2x y 6 4x 2y
2x y 6 4x 2y 4 by substitution
2x y 6 0 4x 2y 4 0 by substitution method
2x y 6 4x 2y 4 by substitution
