1 Linear equations in one variable have one and only one solution.
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1.1 2x+8-4=6 etc
2 Linear equations in two variables may have more than one
solution
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2.1 Ex: 1.2s+3t=5, p+4q=7 et cetera
3 Solutions of linear equations does not change when the same number is subtracted or added to both LHS and
RHS
3.1 or when you multiply or divide both sides by a non-zero number
4 Any equation which can be put in the form ax+by+c=0, where a, b and c are real numbers
and a and b are both non-zero, is called a linear equation in two variables.