If we add the first equation to the second,
the z's will cancel:
To make the z's cancel in the first
and third equations, we multiply the first
equation through by 3:
Add the first equation to the third equation:
To make the x's cancel, divide the third
equation by -2
Add the third equation to the second equations:
Substitute 1 for y in the second equation
Multiply 3 by 1 in the second equation
Add 3 to both side of the second equation:
Divide the second equation through by 5
Substitute 1 for y and 2 for x in the first equation:
Multiply 9 by 2 and 6 by 1:
Combine 18-6 as 12 in the first eqauation
Subtract 12 from both sides of the first equation
Divide the first equation through by -3
Edwin
