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1) 2x + 7y = 23 (4)
2) 4x - y = 1 (-2)
8x + 28y = 92
-8x + 2y = - 2
------------------
0x +30y = 90
30y = 90
y = 90/30
y = 3
Reemplazo y = 3 en ecuación 2 inicial.
4x - y = 1
4x - (3) = 1
4x - 3 = 1
4x = 1 + 3
4x = 4
x = 4/4
x = 1
C.S =
y = 3
x = 1
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1) 4x - 2y = 4 (3)
2) 3x + 3y = 21 (2)
12x - 6y = 12
6x + 6y = 42
------------------
18x + 0y = 54
18x = 54
x = 54/18
x = 3
Reemplazo x = 3 en ecuación 2.
3x + 3y = 21
3 (3) + 3y = 21
9 + 3y = 21
3y = 21 - 9
3y = 12
y = 12/3
y = 4
C.S:
x = 3
y = 4