Mikä on -4x + 11y = 15, kun x = 2 y?

Mikä on -4x + 11y = 15, kun x = 2 y?
Anonim

Vastaus:

# X = 10 #

# Y = 5 #

Selitys:

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

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

2 kohta (1)

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

# -8y + 11y = 15 #

# 3y = 15 #

# Y = 5 # --- (3)

3 kohta (2)

# X = 2y #

# X = 2times5 #

# X = 10 #