Čo je -4x + 11y = 15, keď x = 2 y?

Čo je -4x + 11y = 15, keď x = 2 y?
Anonim

odpoveď:

# X = 10 #

# Y = 5 #

vysvetlenie:

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

# X = 2y # --- (2)

Sub (2) do (1)

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

# -8y + 11Y = 15 #

# 3y = 15 #

# Y = 5 # --- (3)

Sub (3) až (2)

# X = 2y #

# X = 2times5 #

# X = 10 #