The equation of a line is given below. 9x - 3y=3
Find the slope and the y-intercept.
Then use them to graph the line.

The data set would have a linear association.

The data set would have a positive correlation.

Students that study more tend to earn better grades on the test.

Step-by-step explanation:

I think your question is missed of key information, allow me to add in and hope it will fit the original one.  

Please have a look at the attached photo.  

My

Given the information:

"for every 30 minutes studied, the grade increased by 8 points"

=> The rate of change of marks for 30 mins is 8

and in 1 hour = 60 mins = 2*30 mins

=>  The rate of change of marks for 60 mins is: 2*8 =16

=> The data set would have a linear association.

Moreover, as analysed above, we can conclude that students that study more tend to earn better grades on the test so the data set would have a positive correlation.

We choose 3 options:

Hope it will find you well.