Co to jest -4x + 11y = 15, gdy x = 2 y?

Co to jest -4x + 11y = 15, gdy x = 2 y?
Anonim

Odpowiedź:

# x = 10 #

# y = 5 #

Wyjaśnienie:

# -4x + 11y = 15 # --- (1)

# x = 2y # --- (2)

Sub (2) do (1)

# -4 (2y) + 11 lat = 15 #

# -8y + 11y = 15 #

# 3y = 15 #

# y = 5 # --- (3)

Sub (3) do (2)

# x = 2y #

# x = 2 x 5 #

# x = 10 #