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If: 5x-9y = 7 and 7y-3x = -5 Then: x = 1/2 or 0.5 and y = -1/2 or -0.5
5x - 5 = 3x - 9 add 5 to both sides: 5x =3x -4 subtract 3x from both sides: 2x = -4 Divide both sides by 2: x = -2
5x + 5 = 8 -3x 5x = 3 -3x 8x = 3 x = 0.375
3x + 5 = 5x + 2 Subtract 3x from both sides: 5 = 2x + 2 Subtract 2 from both sides: 3 = 2x Divide both sides by 2: 3/2 = x
5x - 2x = -5 - 1 ie 3x = -6 so x = -2