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Mathematics
Mathematics
Problem
Consider the following three equations: (I)
2
x
+
3
y
=
7
2x + 3y = 7
2
x
+
3
y
=
7
(II)
3
x
−
3
y
=
9
3x - 3y = 9
3
x
−
3
y
=
9
(III)
5
x
+
6
y
=
8
5x + 6y = 8
5
x
+
6
y
=
8
Which pair of equations will allow
y
y
y
to be eliminated by directly adding or subtracting the two equations without any scaling? State only the pair number(s).
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