penyelesaian dari sistem persamaan 4x-3y=-18 dan 3x+4y=-1

4x-3y = -18 | x4 | 16x - 12y = -72
3x+4y = -1. | x3 | 9x + 12y = -3
------------------------- +
25x = -75
x. = -75 : 25 = -3

Y = 3x + 4y = -1
= 3.3 + 4y = -1
= 9 + 4y = -1
= 4y = -1 -9
= 4y = -10
= y = -10:4 = -2,5