Question

Tolong jawab pakai cara, poinya 20, jgn asal jawab, tdk tau gk usah di jawab.

Answer 1

X=180, y=130, z=170.

Answer 2

Persamaan (1):

x + y + z = 480

Persamaan (2):

x + y = 310

Persamaan (3):

y + z = 300

Eliminasi (1) & (2):
x + y + z = 480
x + y       = 310
-------------------- (-)
             z = 170

Substitusi (3):
y + z = 300
y + 170 = 300
y = 130

Substitusi (2):
x + y = 310
x + 130 = 310
x = 180

∴ x = 180cm ; y = 130cm ; z = 170cm