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You must isolate the variable, for example:
If 3x + 5 = 14
you first subtract five from each side
3x + 5 = 14
- 5 - 5
which results in
3x = 9
you then divide both sides by 3
3x = 9
--- ---
3 3
so you are left with:
x = 3
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This can happen in different ways: a) More variables than equations. For instance, a single equation with two variables (such as x + y = 15), two equations with three variables, two equations with four variables, etc. b) To of the equations describe the same line, plane, or hyper-plane - this, in turn, will result in that you "really" have less equations than it seems. For example: y = 2x + 3 2y = 4x + 6 The second equation is simply the first equation multiplied by 2.
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By substitution or elimination of one of the variables which usually involves simultaneous or straight line equations.
How doI solve system of equations by substitution?
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