A) 3x - 4y = 41
11x + 6y = 47
de la primera despejas x o y ahora vamos a despejar x
x = (41 + 4y) / 3
reemplezamos abajo
11((41 + 4y) / 3) + 6y = 47
(62y / 3) + (451 / 3) = 47
y = - - 5
reemplazas donde despejaste x para ontener su valor
x = (41 + 4y) / 3 = 61 / 3
b) 10x - 3y = 36
2x + 5y = - 4
x = (3(y + 12)) / 10
2((3(y + 12)) / 10) + 5y = - 4
(3(y + 12)) / 5) + 5y = - 4
(28y) / 5 + (36 / 5) = - 4
y = - 2
x = (3( - 2 + 12)) / 10 = 3
c) 18x + 5y = - 11
12x + 11y = 31
y = - (18x + 11) / 5
12x - 11((18x + 11) / 5) = 31
x = - 2
y = - (18 * - 2 + 11) / 5 = 5
d) 12x - 14y = 20
12y - 14x = - 19
x = (7y + 10) / 6
12y - 14((7y + 10) / 6) = - 19
y = - 1
x = (7y + 10) / 6 = (1 / 2)
e) 9x + 11y = - 14
6x - 5y = - 34
x = - (11y + 14) / 9
6( - (11y + 14) / 9) - 5y = - 34
y = 2
x = - (11y + 14) / 9 = - 4
f) 11x - 9y = 2
13x - 15y = - 2
x = (9y + 2) / 11
13((9y + 2) / 11) - 15y = - 2
y = 1
x = (9 * 1 + 2) / 11 = 1
g) 9x + 7y = - 4
11x - 13y = - 48
x = - (7y + 4) / 9
11( - (7y + 4) / 9) - 13y = - 48
Y = 2
x = - (7 * 2 + 4) / 9 = - 2
h) 15x - y = 40
19x + 8y = 236
x = (y + 40) / 15
19((y + 40) / 15) + 8y = 236
y = 20
x = (20 + 40) / 15 = 4.