Question

sistema pelo metodo da adiçao {6x+9y=-15 15x-18y=84

Answer 1

6x+9y= -15 (.2)
15x-18y = 84

12x+18y= -30
15x-18y = 84

27x = 54
x= 54/27
x = 2

6x+9y= -15
6.2 + 9y= -15
12+9y= -15
9y= -15-12
9y = -27
y = -27/9
y = -3

s = (2, -3)