3X + 6 = 12
subtract 6 from each side
3X + 6 - 6 = 12 - 6
3X = 6
divide each sides integer by 3
(3/3)X = 6/3
X = 2
------------check in original equation
3(2) + 6 = 12
6 + 6 = 12
12 = 12
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-5x + x + 9 = -4x + 12 -4x + 9 = -4x + 12 9 = 12 This equation has no solution.
Is an equation of a straight line in 3 dimensions. It cannot be simplified further, and a solution for any of the variables requires another two [independent] equations.
x = 12 y = 2 (12,2) satifies the equation
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2x+3y=12 ......1st equation 3x+2y=13 .......2nd equation ____________________________________ multiplying 1stt equation by 3 and 2nd equation by 2 3x(2x+3y=12) 2x(3x+2y=13) _______________________________ now the equations become 6x+9y=36 ...3rd 6x+4y=26 ....4th by solving both equation(substractinf 4th from 3rd) we get.. 5y=10 therefore y=2 and x=3