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16x +20y=1100
-16x-16y= -960
16x +20y=1100
----------------------
4y= 140 x+35=60
y= 35 x= 25
Conprobemos: X+y=60 Tambien lo puedes hacer en la otra ec.
25+35=60
60=60
2
.X+y=58 --------------------Multiplicamos por -2
2x+4y=168
-2x-2y =-116
2x+4y =168
----------------
2y = 52 X+26=58
y=26 x= 32
Comprobemos=: .32+26=58
58 =58
3.
X+6y=27 ----------------Multiplicamos por -7
7x-3y=9
-7x-42y = -189
7x-3y =9
--------------------
-45y =-180 X+6(4)=27
y = 4 x+ 24 = 27
x = 3
Comprobemos: 3+6(4)= 27 y 7(3)- 3(4 =9
3+24 = 27 21 -12 = 9
27 = 27 9 = 9