rozwiąż układy równań metodą podstawiania: a) 5x = 4 - 2y 4x + y = 3 b) 6x - 3y = 9 x + 5y = -9,5

a) 5x = 4 - 2y 4x + y = 3 5x = 4 - 2y y = 3 - 4x 5x = 4 - 2(3-4x) 5x = 4 - 6 + 8x -3x = - 2 x = -2 / 3 y = 3 - 4(-2/3) y = 3 i 8 / 3 b) 6x - 3y = 9 x + 5y = -9,5 6x - 3y = 9 x = -9,5 - 5y 6(-9,5 - 5y) - 3y = 9 57 - 30y - 3y = 9 -27y = -48 9y = 16 y = 16/9 x = -9,5 - 80 / 9 x = - 331/18

5x = 4 - 2y 4x + y = 3 I-4x 5x = 4 - 2y y=3-4x 5x=4-2(3-4x) y=3-4x 5x=4-6+8x I-8x y=3-4x -3x=-2 I÷-3 y=3-4x x=2/3 y=3-4*2/3 x=2/3 y=1/3 b) 6x - 3y = 9 x + 5y = -9,5 I-5y 6x - 3y = 9 x=-9,5-5y 6*(-9,5-5y)=9 x=-9,5-5y -57-30y=9 I+57 x=-9,5-5y -30y=66 I÷(-30) x=-9,5-5y y=2,2 x=-9,5-5*2,2 y=2,2 x=20,5