ALGEBRA
posted by mary .
A golf ball is tossed straight down out of an airplane. The downward velocity of the ball at various times is given in the table below.
SEC AFTER THROW DW VELOSCITY
X m/s Y
1 21.8
1.6 27.68
2 31.6
2.2 33.56
What is the slope of the line that firs this data?
Is it 7.8 8.8 9.8 or 10.8
I tried to figure out this one but I am lost I am lost HELP!!

slope: change y/change x= (33.5621.8)/(2.21)= 9.8