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Old 07-27-2007   #2
Pedro Gonzaga
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1)y = 2x + 13x - 4(2x + 1) = 1y = 2x + 1-5x = 5y = 2(-1) + 1x = -1x = -1y = -12)5(6 - 3y) - 6y = 23x = 6 - 3y30 - 15y - 6y = 23x = 6 - 3yy = 1/3x = 6 - 3(1/3) y = 1/3x = 53)x + y = 12x - 3y = 8y = 1 - x2x - 3(1-x) = 8y = 1 - x5x = 11y = 1 - 11/5x = 11/5y = -6/5x = 11/54)x = 3 - 2y2(3-2y) + y = 5x = 3 - 2y6 - 4y + y = 5x = 3 - 2y-3y = -1x = 3 - 2(1/3)y = 1/3x = 7/3y = 1/35)y - 3x = 53(x+1) = y - 2y = 5 + 3x3x + 3 = 5 + 3x - 2y = 5 + 3x0x = 0Indeterminated6)2y = 1 - 4x2x + y = 0y = 1/2 - 2x2x + 1/2 - 2x = 0y = 1/2 - 2x0x = -1/2Impossible!