Question

rozwiązanie układów równań 1) x+2y//4 - (x-1/3)=1+y y+3//6+2-x//8=3/2

2) 11(3x-2y)+18(2x-3y)=117 27(2x-3y)-2(3x-2y)=9

3) 11/20y- 0,8(1/4k +2,5 )=2,5 6x-0,3y//2 - 1,5=2+2x

Answer 1

1)
10y + 20 + x - 5 = x - 5
25y + 50 + 3x - 15 = -10

10y + x - x = -5 - 20 + 5
25y + 3x = -10 - 50 + 15

10y = -20 /:2
25y + 3x = -45/:(-5)

5y = -10
-5y - 15x = 9

-15x = -10 + 9
-15x = -1/:9(-15)
x = 1/15

25y +3x = -45
25y + 3 * 1/15 = -45
25y + 3/15 = -45
25y = -45 - 3/15
25y = -45 i 3/15 /:25
y = -45 i 3/15 : 25/1
y = -678/15 * 1/25
y = -678/375
y = -1 i 101/125