Gus has a lunch food budget of $130 per month. He spends an average of $6 per day on lunch. Which of the following equations represents how much money is left in his lunch budget after x days of buying lunch?
A.
y = 130 - 6x
B.
y = 130x - 6
C.
y = 6x - 130
D.
y = 130 + 6x
A.
y = 130 - 6x