Question

Resolva o sistema
5x + y = -1
X+4y = 15

Answer 1

5x +y = -1. y= -1 -5x
x + 4y = 15

x + 4(-1 -5x)= 15

x-4-20x=15
-19x=19
x= -1


y= -1 - 5x

y = -1 -5(-1)

y = 4


resposta X= -1. y= 4