Pre-calculus, please help...

Pre-calculus, please help...the data represents schores on an algebra achievement test and calculus achievement test for the same student. Treat the algebra test score as the independent variable and calculus test score as the dependent variable.

Algebra score calculus score
17 73
21 66
11 64
16 61
15 70
11 71
24 90
27 68
19 84
8 52

a. explain what the slope value represents

b. predict the score a student would receive on the calculus acievement rest if she scored a 20 on the algebra achievement test.