LINEAR EQUATIONS IN TWO VARIABLES
π An equation of the form `ax + by + c = 0`, where `a, b` and `c` are real numbers, such that `a` and `b` are not both zero, is called a linear equation in two variables.
Examples:
`1.2s + 3t = 5, p + 4q = 7, Οu + 5v = 9` and `3 = \sqrt2 x – 7y`.
Note that you can put these equations in the form `1.2s + 3t – 5 = 0,
p + 4q – 7 = 0, Οu + 5v – 9 = 0` and `2 x – 7y – 3 = 0`, respectively.
π Equations of the type `ax + b = 0` are also examples of linear equations in two variables because they can be expressed as
`ax + 0.y + b = 0`
For example, `4 – 3x = 0` can be written as `–3x + 0.y + 4 = 0`.
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