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а)
![- x = 6 - 4y \\ x = 4y - 6 \\ \\ 8y - 6(4y - 6) = 7 \\ 8y - 24y + 36 = 7 \\ - 16y = - 29 \\ y = \frac{29}{16} = 1.8125\\ x = 4 \times \frac{29}{16} - 6 = \frac{29}{4} - 6 = \frac{29 - 24}{4} = \frac{5}{4} - x = 6 - 4y \\ x = 4y - 6 \\ \\ 8y - 6(4y - 6) = 7 \\ 8y - 24y + 36 = 7 \\ - 16y = - 29 \\ y = \frac{29}{16} = 1.8125\\ x = 4 \times \frac{29}{16} - 6 = \frac{29}{4} - 6 = \frac{29 - 24}{4} = \frac{5}{4}](https://tex.z-dn.net/?f=+-+x+%3D+6+-+4y+%5C%5C+x+%3D+4y+-+6+%5C%5C++%5C%5C+8y+-+6%284y+-+6%29+%3D+7+%5C%5C+8y+-+24y+++%2B+36+%3D+7+%5C%5C++-+16y+%3D++-+29+%5C%5C+y+%3D++%5Cfrac%7B29%7D%7B16%7D+++%3D+1.8125%5C%5C+x+%3D+4+%5Ctimes++%5Cfrac%7B29%7D%7B16%7D++-+6+%3D++%5Cfrac%7B29%7D%7B4%7D++-+6+%3D++%5Cfrac%7B29+-+24%7D%7B4%7D++%3D++%5Cfrac%7B5%7D%7B4%7D+)
б)
![- y = 10 - 3x \\ y = 3x - 10 \\ 6x + 2(3x - 10) = 1 \\ 6x + 6x - 20 = 1 \\ 12x = 21 \\ x = \frac{21}{12} = \frac{7}{4} \\ y = 3 \times \frac{7}{4} - 10 = \frac{21 - 40}{4} = - \frac{19}{4} - y = 10 - 3x \\ y = 3x - 10 \\ 6x + 2(3x - 10) = 1 \\ 6x + 6x - 20 = 1 \\ 12x = 21 \\ x = \frac{21}{12} = \frac{7}{4} \\ y = 3 \times \frac{7}{4} - 10 = \frac{21 - 40}{4} = - \frac{19}{4}](https://tex.z-dn.net/?f=+-+y+%3D+10+-+3x+%5C%5C+y+%3D+3x+-+10+%5C%5C+6x+%2B+2%283x++-+10%29+%3D+1+%5C%5C+6x+%2B+6x+-+20+%3D+1+%5C%5C+12x+%3D+21+%5C%5C+x+%3D++%5Cfrac%7B21%7D%7B12%7D++%3D++%5Cfrac%7B7%7D%7B4%7D++%5C%5C+y+%3D+3+%5Ctimes++%5Cfrac%7B7%7D%7B4%7D++-+10+%3D++%5Cfrac%7B21+-+40%7D%7B4%7D++%3D+++-+%5Cfrac%7B19%7D%7B4%7D+)
б)
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