Examine the consistency of the system of equations
`x + y + z = 1`
`2x + 3y + 2z = 2`
`a x + a y + 2a z = 4`

Explanation

Given system of equations,
x+y+z=1
2x+3y+2z=1
ax+ay+2az = 4
`rArr" "[{:(1,1,1),(2,3,2),(a,a,2a):}][{:(x),(y),(z):}]=[{:(1),(1),(4):}]rArrAX=B`
`therefore" "A=[{:(1,1,1),(2,3,2),(a,a,2a):}]`
`rArr" "|A|=[{:(1,1,1),(2,3,2),(a,a,2a):}]`
=1(6a-2a)-1(4a-2a)+1(2a-3a)
`= 4a-2a-a=ne0`
`therefore` A is invertible.
`rArr` Given system of equations is consistent.