Question 4178
well. This all depends what you know :-)


I would suggest Cramer's Rule, using determinants:


D, determinant of the main matrix = 20
Dx, determinant of main matrix with x-values substituted = -52
Dy, determinant of main matrix with y-values substituted = 12
Dz, determinant of main matrix with z-values substituted = 50


so x=Dx/D = -2.6


so y=Dy/D = 0.6


so z=Dz/D = 2.5


Put these values into the 3 equations and you get the correct answers.


Now, how do you calcualte the determinants? Ask me if this is your course. If you have no idea what i am gibbering on about, then ask again to have another solution method.


jon.