selesaiakan setiap sitem persamaan linier brikut dlm bntuk subtitusi 5y- 8z = 19 5x-8z. = 6 3x - 2y = 12 #bantu dgn caranya

5y -8z = 19 ==> 8z = 5y -19. subsitusikan ke 5x -8z = 6, maka 5x -(5y - 19) = 6
5x - 5y +19 = 6
5x -5y = 6-19
5x -5y = -13....(1)
dari 3x -2y = 12
2y = 3x -12
y = (3x -12)/2. subsitusikan ke (1)
5x -5y = -13
5x -5(3x-12)/2 = -13
5x -(15/2)x +30 = -13
-(5/2)x = -13-30
-(5/2)x = -33
x = 66/5
dari y = (3x-12)/2
y = (3.66/5 -12)/2
y = (3.33/5-6)
y = 99/5 - 6
y = 99/5 - 30/5
y = 69/5
dari 5y -8z = 18
5(69/5)-8z = 18
69-8z = 18
-8z = 18-69
-8z = -51
z = 51/8
HP = { (66/5, 69/5, 51/8) }