r: y = 2x + 3
...z = x - 1
a) y = 9 -> 9 = 2x + 3 -> 2x = 6 -> x = 3
x = 3 -> z = x - 1 -> z = 2
P( 3, 9, 2 )
b) x = 2z -> z = 2z - 1 -> z = 1
z = x - 1 -> 1 = x - 1 -> x = 2
y = 2x + 3 -> y = 7
M( 2, 7, 1 )
c) x = 3z -> z = x - 1 -> z = 3z - 1 -> 2z = 1 -> z = 1/2
1/2 = x - 1 -> x = 3/2
y = 2x + 3 -> y = 3 + 3 -> y = 6
N( 3/2 , 6, 1/2 )
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