Question

Solve the system of equations using matrices. Use Gaussian elimination with back-substitution.
3x + 5y - 2w = -13
2x + 7z - w = -1
4y + 3z + 3w = 1
-x + 2y + 4z = -5

Answer 1

B. {(1, -2, 0, 3)}


C. {( 3/4, -2, 0,3/4 )}


D. {(4/3 , -13/20 , 0,5/2 )}

Answer 2

@kirbykirby

Answer 3

Have you tried it ?

Answer 4

SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS

Answer 5

yea, I took this test and missed a lot and got a 45%, that's why there is only 3 answers instead of 4, I cant take this test again, but I want to know how to do these and how I messed?.

Answer 6

Oh dear this is quite long to do here.. but there is a calculator that shows exactly what steps to do (I recommend you follow each step, and write everything down so you understand the mechanics): http://www.math.odu.edu/~bogacki/cgi-bin/lat.cgi?cmd=sys;m1_1=3;m1_2=5;m1_3=0;m1_4=-2;m1_5=-13;m2_1=2;m2_2=0;m2_3=7;m2_4=-1;m2_5=-1;m3_1=0;m3_2=4;m3_3=3;m3_4=3;m3_5=1;m4_1=-1;m4_2=2;m4_3=4;m4_4=0;m4_5=-5;curn=4;curn=5;vdat=4;vdat=R4;whid=V;whid=1;submit21=Submit&hideops=0

Answer 7

Solve the matrix equation for X.