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A)
4x + 7y= 26
-4x + y= -42
---------------------
0 8y= -16
y=-16/8
y=-2
4x + 7(-2) =26
4x- 14 =26
4x= 26 +14
x= 40/4
x= 10
B)
-2x + 5y= -2
2x - 2y= -10
---------------------
0 +3y = -12
y= -12/3
y= -4
2x - 2(-4) = -10
2x + 8 = -10
2x=-10-8
x=-18/2
x= -9
Espero que sirva! Saludos!