What is the slope of the line 2y – 6 = 2x?

a. 1
b. -1
c. -3
d. 3

the best explanation gets marked brainliest (:

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?