solve the equations

Question

Solve the equations:

3a+b+c+d =4

a+3B+c+d =-2

a+b+3c+d =10

a+b+c+3d =0

Answer 1

With four simultaneous linear equations, I like to use the graphing calculator, and its RREF method.

I input augmented system matrix (4 rows, 5 columns, last col. containing righthand side constants) and this gives a quick answer and avoids all possible screw-ups which are so common when doing hand calculations.