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[tex]6a - 8b = 4 \\ 3a - 4b = 2 \\ 3a = 2 + 4b \\ a = \frac{2 + 4b}{3} \\ \\ \frac{9 {a}^{2} - 24ab + 16 {b}^{2} }{50} = \frac{9 {( \frac{2 + 4b}{3}) }^{2} - 24b \times \frac{2 + 4b}{3} + 16 {b}^{2} }{50} = \frac{ \frac{9 \times (4 + 16b +16 {b}^{2} )}{9} - \frac{24b \times (2 + 4b)}{3} + 16 {b}^{2} }{50} = \frac{4 + 16b + 16 {b}^{2} - 16b - 32 {b}^{2} + 16 {b}^{2} }{50} = \frac{4}{50} = \frac{2}{25} = \frac{8}{100} = 0.08[/tex]

2/25 и 0.08