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x=7y-4/8 x=3y+6/6
7y-4/8=3y+6/6
6(7y-4)=8(3y+6)
42y-24=24y+48
42y-24y=48+24
18y=72
y=72/18
y=4
Sustituyendo y:
x=3(4)+6/6
x=3
b) x+6y=27 y 7x-3y=9
y=27-x/6 y=-7x+9/-3
27-x/6=-7x+9/-3
-3(27-x)=6(-7x+9)
-81+3x=-42x+54
3x+42x=54+81
45x=135
x=135/45
x=3
Sustituyendo x:
y=27-3/6
y=4
c) .3x-2y=6 y 6x-4y=12
y=-3x+6/-2 y=-6x+12/-4
3x+6/-2=-6x+12/-4
-4(3x+6)=-2(-6x+12)
-12x+-24=-12x-24
-12x+12x=-24+24
0x=0
(Okay esta no tiene solucion porque intente hacerla de ambas formas y da 0)
d) 15x-11y=-87 y -12x-5y=-27
x=11y-87/15 x=5y-27/-12
11y-87/15=5y-27/-12
-12(11y-87)=15(5y-27)
-132y+1044=75y-405
1044+405=75y+132y
1449=207y
1449/207=y
y=7
Sustituyendo y:
x=5(7)-27/-12
x=2/3 = 0.66