A membership costs 50tojoinand50 to join and 50tojoinand10 per month. The total cost yyy after xxx months is:
y=50x+10y = 50x + 10y=50x+10
y=10x+50y = 10x + 50y=10x+50
y=60xy = 60xy=60x
y=500xy = 500xy=500x