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
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What is the average rate of change for this function for the interval from x=2 to x=4 ?

If the cost to mail a package is an initial $5 and $0.28 for every pound the total cost to mail a package was $11.27, how much did the package weigh?