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y= 1-x
3x+5(1-x)=1
3x+5-5x=1
-2x=-4
x=-4/-2
x=2 y= 1-2
y=-1
b)
3x+2y=7
y=7-3x/2
7x+8(7-3x/2) = 23
simplificas el 8 con el 2 quedandote 7x+4(7-3x)=23
7x+28-12x=23
-5x=23-28
-5x=-5
x=-5/-5
x=1 y=7-3(1)/2
y=4/2
y=2
c)
3x+y=10
y=10-3x
2x-(10-3x)=10
2x-10+3x=10
5x=20
x=20/5
x=4 y=10-3(4)
y=10-12
y= -2
d)
4x+y=11
y=11-4x
5x-3(11-4x)=1
5x-33+12x=1
17x=34
x=34/17
x=2 y=11-4(2)
y=11-8
y=3
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