a)3x + 2y=16 ; 4x + y=13
y= 13-4x
3x+2*(13-4x)=16
3x+26-8x=16
-5x=-10
x=-10/-5
x=2
para "y"
y=13-4*(2)
y=5
b)5x + 2y=10 ;3x - y=6
y=3x-6
5x+2*(3x-6)=10
5x+6x-12=10
11x=22
x=22/11
y=3*2-6
y=0
c)2x + 7y=17 ; 5x + 4y=2
5x=2-4y
x=0.4-0.8y
2*(0.4-0.8y)+7y=17
0.8-1.6y+7y=17
5.4y=16.2
y=16.2/5.4
y=3
Para "X"
x=0.4-0.8*3
x=-2
d)3x - 8y=1 ;5x + 4y=7
5x=7-4y
x=1.4-0.8y
3*(1.4-0.8y)-8y=1
4.2-2.4y-8y=1
-10.4y=-3.2
y=-3.2/-10.4
y=4/13
x=1.4-0.8*(4/13)
x=15/13
Espero haber ayudado :=)
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a)3x + 2y=16 ; 4x + y=13
y= 13-4x
3x+2*(13-4x)=16
3x+26-8x=16
-5x=-10
x=-10/-5
x=2
para "y"
y=13-4*(2)
y=5
b)5x + 2y=10 ;3x - y=6
y=3x-6
5x+2*(3x-6)=10
5x+6x-12=10
11x=22
x=22/11
x=2
para "y"
y=3*2-6
y=0
c)2x + 7y=17 ; 5x + 4y=2
5x=2-4y
x=0.4-0.8y
2*(0.4-0.8y)+7y=17
0.8-1.6y+7y=17
5.4y=16.2
y=16.2/5.4
y=3
Para "X"
x=0.4-0.8*3
x=-2
d)3x - 8y=1 ;5x + 4y=7
5x=7-4y
x=1.4-0.8y
3*(1.4-0.8y)-8y=1
4.2-2.4y-8y=1
-10.4y=-3.2
y=-3.2/-10.4
y=4/13
Para "X"
x=1.4-0.8*(4/13)
x=15/13
Espero haber ayudado :=)