Question

System of equations. x+y+z=11 y+z=5 z=9

find the solution

Answer 1

1. z=9
2. y add z= 5

1. or, y add 9=5
2. or, y= 5 - 9 = - 4
3. y = - 4

x add y add z = 11

x sub 4 add 9= 11

x add 5= 11

x = ll sub 5

x= 6