Please explain. :) Thanks and will give feedback

The shear strength of the bond between two types of propellant is important in the manufacturing of a rocket motor.An investigator is interested in whether the age of the propellant is related to the shear strength? Data from 26 paired observations were used to fit a a least-squares simple linear regression model predicting shear strength from propellant age (in weeks). The equation for the regression is given by y = 1050 - 38x. Use this equation to predict the shear strength of a propellant that is 17 weeks old. O -404 O 404 O 39883 O -39883