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Solve the following pair of linear equations by the substitution method.
3x - y = 3 and 9x - 3y = 9
0.2x + 0.3y = 1.3 and 0.4x + 0.5y = 2.3
Solve 2x + 3y = 11 and 2x - 4y = -24 and hence find the value of ‘m’ for which y = mx + 3.