[tex] - 2(2x + 1) + 2.5 = 3( y+ 2) - 8x \\ 8 - 5(4 - x) = 6y - (5 - x) \\ \\ - 4x - 2 + 2.5 = 3y + 6 - 8x \\ 8 - 20 + 5x = 6y - 5 + x \\ \\ - 4x - 3y + 8x = 6 - 0.5 \\ 5x - 6y - x = - 5 + 12 \\ \\ 4x - 3y = 5.5 \\ 4x - 6y = 7 \: \: | \times ( - 1) \\ \\ 4x - 3y = 5.5 \\ - 4x + 6y = - 7 \\ \\ 6y - 3y = 5.5 - 7 \\ 3y = - 1.5 \\ y = - 1.5 \div3 \\ y = - 0.5 \\ \\ 4x - 3 \times ( - 0.5) = 5.5 \\ 4x + 1.5 = 5.5 \\ 4x = 5. 5- 1.5 \\ 4x = 4 \\ x = 4 \div 4 \\ x = 1[/tex]
Ответ: ( 1 ; - 0,5 )
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[tex] - 2(2x + 1) + 2.5 = 3( y+ 2) - 8x \\ 8 - 5(4 - x) = 6y - (5 - x) \\ \\ - 4x - 2 + 2.5 = 3y + 6 - 8x \\ 8 - 20 + 5x = 6y - 5 + x \\ \\ - 4x - 3y + 8x = 6 - 0.5 \\ 5x - 6y - x = - 5 + 12 \\ \\ 4x - 3y = 5.5 \\ 4x - 6y = 7 \: \: | \times ( - 1) \\ \\ 4x - 3y = 5.5 \\ - 4x + 6y = - 7 \\ \\ 6y - 3y = 5.5 - 7 \\ 3y = - 1.5 \\ y = - 1.5 \div3 \\ y = - 0.5 \\ \\ 4x - 3 \times ( - 0.5) = 5.5 \\ 4x + 1.5 = 5.5 \\ 4x = 5. 5- 1.5 \\ 4x = 4 \\ x = 4 \div 4 \\ x = 1[/tex]
Ответ: ( 1 ; - 0,5 )