Respuesta:
x = 2
y = -3
Explicación paso a paso:
4x + 5y = -7
5x - 3y = 19
4x + 5y = -7
5y = -7 - 4x
y = (-7 - 4x) / 5
5x - 3y = 19
-3y = 19 - 5x
y = (19 - 5x) / -3
(-7 - 4x) / 5 = (19 - 5x) / -3
(-3)(-7 - 4x) = (5)(19 - 5x)
21 + 12x = 95 - 25x
12x + 25x = 95 - 21
37x = 74
x = 74 / 37
x = 2
y = (19 - 5x) / -3
y = (19 - 5(2)) / -3
y = (19 - 10) / -3
y = 9 / -3
y = -3
