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x+y=3
_________
2x+2y=6
3x+2y=24
___________
1x+0y=18
x=18/1
X¹=18
Sustitución:
3x+2y=24
3x(18)+2=24
64+2=24
2y=24-64
y= -40/2
y=20
B) X+y=58
2x+4y=168
___________
4x+4y=232
2x+4y=168
___________
2x+0=74
x=74/2
X=37
Sustitución
X+y=58
X(37)+2=58
37+2=58
2y=58-37
y=21/2
Y=10.5
C)2x+3y=1
3x+4y=0
_________
8x+12y=4
6x+12y=0
__________
2x+0y=4
X=4/2
X=2
Sustitución
2x+3y=1
2x(2)+3y=1
4x+3y=1
3y=4-1
Y=3/3
Y=1