ejercicio el algebra de baldor ejercicio 184 numero 16
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x+9 y +21
-------- = ----------
x-9 y+39
x+8 y+19
------ = -----------
x-8 y+11
quitmos los denominadores
x+9 y +21
-------- = ----------
x-9 y+39
simplemente multiplicamos en cruz para que no te confundas
(x+9)(y+39)=(x-9)(y+21)
xy+39x+9y+351 = xy+21x-9y-189
xy+39x+9y+351 - xy-21x+9y+189 =0
18x+18y+540=0
18(x+y+30=0)
x +y+30=0
x+y=-30------> ecuacion 1
x+8 y+19
------ = -----------
x-8 y+11
(x+8)(y+11) = (y+19)(x-8)
xy + 11x +8y+88 =xy-8y+19x -152
xy + 11x +8y+88 -xy+8y-19x +152=0
-8x +16y+240 =0
-8(x-2y-30=0)
x-2y-30=0
x-2y=30------------>ecuacion2
x+y=-30
x-2y=30
|-30...+1|
| 30....-2| 60 - 30 30
------------- = ---------------- = -------- = -10
|1......+1| -2 - 1 -3
|1.......-2|
|1......-30|
|1.......30| 30 + 30 60
----------------=----------------------=--------= -20
|1.........1| -2 -1 -3
|1........-2|
Resppuesta | x= -10
y= -20
-------- = ----------
x-9 y+39
x+8 y+19
------ = -----------
x-8 y+11
quitmos los denominadores
x+9 y +21
-------- = ----------
x-9 y+39
simplemente multiplicamos en cruz para que no te confundas
(x+9)(y+39)=(x-9)(y+21)
xy+39x+9y+351 = xy+21x-9y-189
xy+39x+9y+351 - xy-21x+9y+189 =0
18x+18y+540=0
18(x+y+30=0)
x +y+30=0
x+y=-30------> ecuacion 1
x+8 y+19
------ = -----------
x-8 y+11
(x+8)(y+11) = (y+19)(x-8)
xy + 11x +8y+88 =xy-8y+19x -152
xy + 11x +8y+88 -xy+8y-19x +152=0
-8x +16y+240 =0
-8(x-2y-30=0)
x-2y-30=0
x-2y=30------------>ecuacion2
x+y=-30
x-2y=30
|-30...+1|
| 30....-2| 60 - 30 30
------------- = ---------------- = -------- = -10
|1......+1| -2 - 1 -3
|1.......-2|
|1......-30|
|1.......30| 30 + 30 60
----------------=----------------------=--------= -20
|1.........1| -2 -1 -3
|1........-2|
Resppuesta | x= -10
y= -20
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