Penjelasan dengan langkah-langkah:

sistem Persamaan Linear Dua Variabel

15x - 9y +1 = 0 ---> 15x -9y= -1 .. pers (1)

10x +2y-8= 0 ---> 10x+2y= 8 .. pers (2)

Eliminasi persamaan (1) dan (2)

.

15x -9y= -1 |x10|

10x+2y= 8 |x15|

150x -90y= -10

150x + 30y = 120

______________ _

-120y = -130

y = 130/120

y = 13/12

.

substitusi nilai y

10x+2y= 8

10x + 2(13/12) = 8

10x + ⅙(13)= 8

10x = 8-13/6

10x = (48 - 13)/6

10x = 35/6

x = 35/6 : 10/1

x = 35/6 x 1/10

x = 35/60

x = 7/12

.

= 20x -3y

= 20(7/12) - 3(13/12)

= 140/12 - 39/12

= 101/12

= 8 ⁵/12