If the system of linear equations $2x + 3y = 7$ and $2ax + (a + b)y = 28$ have infinite number of solutions, then find the values of 'a' and 'b'.

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Step 1: For infinite solutions: $\frac{2}{2a} = \frac{3}{a + b} = \frac{7}{28}$
Step 2: $\frac{2}{2a} = \frac{7}{28} = \frac{1}{4} \Rightarrow a = 4$
Step 3: $a + b = 12 \Rightarrow b = 8$

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