I have 4 numbers: The Average hours of study per week and the scores achieved of 2 students

The numbers are 7 hours with a score of 75.45 and 20 hours with a score of 92.2 and the question asks me to use matrcies to find if there is a linear relationship between the two. I don't quite understand how to find if there is a linear relationship.

I thought about using Gauss elimination but then realised that didn't really help me..