-10
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You cannot purely solve 3x - y = 13 because there is only one equation for two variables. However, you can specify x or y in terms of the other. For example
3x - y = 13
-y = 13 - 3x
y = -13 + 3x
y = 3x - 13.
3xy - 3xy = 0
13-3x = 43 -3x = 43-13 -3x = 30 x = -10
This is the same as: 13-2b = 21 -2b = 21-13 -2b = 8 b = -4
Solved for y: y=(3x-13)/5 Solved for x: x=(5y+13)/3
y = 2x -1 y = 5x -13 So: 5x -13 = 2x -1 5x -2x = 13 -1 3x = 12 x = 4 and by substituting y = 7