A) 3x + 2y = 24 x + y = 3 _________ 2x + 2y = 6 3x + 2y = 24
___________ 1x + 0y = 18 x = 18 / 1
X¹ = 18
Sustitución :
3x + 2y = 24
3x(18) + 2 = 24
64 + 2 = 24
2y = 24 - 64
y = - 40 / 2
y = 20
B) X + y = 58 2x + 4y = 168
___________ 4x + 4y = 232 2x + 4y = 168
___________ 2x + 0 = 74 x = 74 / 2 X = 37
Sustitución
X + y = 58
X(37) + 2 = 58 37 + 2 = 58 2y = 58 - 37 y = 21 / 2 Y = 10.
5
C)2x + 3y = 1 3x + 4y = 0
_________ 8x + 12y = 4 6x + 12y = 0
__________ 2x + 0y = 4 X = 4 / 2
X = 2
Sustitución
2x + 3y = 1
2x(2) + 3y = 1
4x + 3y = 1
3y = 4 - 1
Y = 3 / 3
Y = 1.