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Question 1 · 3 marks
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Solve the simultaneous equations
2
x
+
y
+
z
=
4
2x + y + z = 4
2
x
+
y
+
z
=
4
,
x
−
y
+
2
z
=
11
x - y + 2z = 11
x
−
y
+
2
z
=
11
,
3
x
+
2
y
−
z
=
−
5
3x + 2y - z = -5
3
x
+
2
y
−
z
=
−
5
.
x
=
x =
x
=
y
=
y =
y
=
z
=
z =
z
=