Question

qual das alternativas?

Answer 1

aranhas:8
joaninhas:6
___________
x+y=15——————>joaninhas(y), aranhas(x)
8x+6y=108

x=15-y
8(15-y)+6y=108

120-8y+6y=108
-8y+6y= -12
-2y= -12 (-1)
2y=12
y=6
_________

x+6=15
x=9