Question

Sistem persamaan 5x - 2y = 7 dan x - 3y = 4, berapa himpunan penyelesaiannya !

#Pakai cara

Answer 1

5x - 2y = 7
x - 3y = 4

5x - 2y = 7| x 1 | 5x - 2y = 7
x - 3y = 4  | x 5 | 5x - 15y = 20

5x - 2y = 7
5x - 15y = 20
___________-
-2y - (-15y) = 7 - 20
-2y + 15y = -13
13y = -13
y = -13/13
y = -1

x - 3y = 4
x - 3(-1) = 4
x - (-3) = 4
x + 3 = 4
x + 3 - 3 = 4 - 3
x = 1

Himpunan Penyelesaian = {(1,-1)}

Maaf kalau salah...