Mathematics, 02.03.2021 21:50, Kpthegoat

URGENT step by step answer or just which number fine
Which pair of equations could not be used to solve the following equations for x and y?
4.x +2y = 22
–2x+2y =-8
1)
4x+2y=22
2x-2y=8

2)
4x+2y=22
-4x+4y=-16

3)
12x+6y=66
6x-6y=24

4)
8x+4y=44
-8x+8y=-8

Answers: 2

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Which pair of equations could not be used...