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posted by al on Thursday, January 13, 2011 at 12:59am.
substitution 4x + 3y = 3 7x - 9y = 6
from the 1st 3y = 3-4x or 9y = 9 - 12x now sub that into the 2nd 7x - (9-12x) = 6 19x = 15 x = 15/19 back into 3y = 3-4x 3y = 3 - 60/19 = -3/19 y = -1/19
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