♥•.•´¨`'°ºoO ♥ Ooº°'´¨`•.•♥SISTEMA DE ECUACIONES 2*2 ♥•.•´¨`'°ºoO ♥ Ooº°'´¨`•.•♥

SISTEMA DE ECUACIONES 2*2

1.2x + 3y = 10 Ec. 1
4x + y = 5 Ec. 2
* Despejar x De la Ec. 1*
2X = 10-3Y Ec. 3
2
* Despejar x De la Ec. 2*
4x = 5 -Y
X= 5-Y Ec. 3
4
* Ec. 3 y Ec. 4 Igualar *
10 - 3y 5 - y
________ = ________
2 4
4 (10 -3y ) = 2 ( 5 - y)
40 - 12y = 10 - 2y
-12y + 2y = 10 - 40
-10y = -30
y = 30/-10
y= 3
* Tomo Ec. 3 *
x= 10 - 3 (3)
_______
2
x= 10 - 9
______
2
x= 1/2


2.-3a + 2b = 6
a + 3b = 18
-3a = 6 - 2b 18 - 3b
_______ =________
-3 1
1( 6 - 2b ) = -3 ( 18 - 3b )
6 - 2b = -54 + 9b
-2b + 9b = -54 - 6
11b = -60
b = - 60/-11
b = 5.45
= 5 5/11
a = 18 - 3 (60/11)
a = 18 180
__ - ____
1 11
a = 198 - 180
________
11
a = 18/11
a = 1 7/11
a = 1.63