Решите уравнение: а) 5 · (х – 7) = 3 · (х – 4) – 27 б) 3y + 2 · (2y – 3) = 8 – 7 · (y – 2)
5( x - 7 ) = 3( x - 4 ) - 27 5x - 35 = 3x - 12 - 27 5x - 3x = - 39 + 35 2x = - 4 x = - 2 ------------------------------------ 3y + 2( 2y - 3 ) = 8 - 7( y - 2 ) 3y + 4y - 6 = 8 - 7y + 14 7y + 7y = 22 + 6 14y = 28 y = 2
А) 5*(x-7)=3*(x-4)-27 б)3y+2*(2y-3)=8-7*(y-2) 5x-35=3x-12-27 3y+4y-6=8-7y+14 5x-3x=-12-27+35 3y+4y+7y=8+14+6 2x=-4 14y=28 x=-2 y=2