Question #206200

what is homogeneous linear equation &nonhomogeneous linear equation?what is consistence&incossistence?


1
Expert's answer
2021-07-08T16:39:55-0400

A homogeneous system of linear equations is of the form below for two variables

ax1+bx2=0cx1+dx2=0ax_1+bx_2=0\\ cx_1+dx_2=0\\

i.e the values of the variables when substituted into any of the equation give zero.

However, non-homogeneous system of linear equations is of the form

ax1+bx2=d1cx1+dx2=d2ax_1+bx_2=d_1\\ cx_1+dx_2=d_2

where both d1,d2d_1,d_2 are non-zero.

For three variables, homogeneous system of linear equations is of the form

ax1+bx2+cx3=0dx1+ex2+fx3=0gx1+hx2+jx3=0ax_1+bx_2+cx_3=0\\ dx_1+ex_2+fx_3=0\\ gx_1+hx_2+jx_3=0\\

while a form of non-homogeneous system of linear equations is

ax1+bx2+cx3=d1dx1+ex2+fx3=d2gx1+hx2+jx3=d3ax_1+bx_2+cx_3=d_1\\ dx_1+ex_2+fx_3=d_2\\ gx_1+hx_2+jx_3=d_3\\

If any of the above systems of equations has a solution then such a system of equations is said to be consistent. If the system of equations does not have solution, then the system is inconsistent.

Consider the equations below

x+y=52x2y=6x+y=5\\ -2x-2y=6\\

x and y cannot cancel out due to the reoccurrence of the first equation in the second equation. i.e.

2(x+y)=6-2(x+y)=6

So it's inconsistent.

However, the equations below are consistent.

x+y=5x+y=1x+y=5\\ -x+y=1\\

Because x=2 and y=3.


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