Question

przykłady d,e,f
matematyka 5.34​

Answer 1

d) 1.2x - 2y/3 = 16 / * 3

2y/3 + 0,2x = 5 / * 3

3.6x - 2y = 48

2y + 0,6x = 15 / * (-6)

-2y + 3,6x = 48

-12y - 3,6x = - 90

______________ +

-14y = -42 / : (-14)

y = 3

6 + 0,6x = 15

0,6x = 9 / : (0,6)

x = 9/1 * 10/6 = 90/6 = 15

e) 1/8x + 7 = 0,75y / * 8

0,5x - 1/6y = 6 / * 6

x + 56 = 6y / * (-3)

3x - y = 36

-3x + 18y = 168

3x - y = 36

____________ +

17y = 204

y = 12

3x - 12 = 36

3x = 48

x = 16

f) 2/3x - 1/9y = 6 / * 9

0,5y = 3x - 5

6x - y = 54

5 = 3x - 0,5y / * (-2)

6x - y = 54

y - 6x = -10

_________ +

0 = 44

Równanie sprzeczne