Question

quanto vale essa equação
+1-4y=-15

Answer 1

+1-4y=-15
-4y = -15 -1
-4y = -16 .(-1)
4y = +16
y = 16/4
y = 4

Answer 2

1-4y=-15
-4y=-15-1
-4y=-16
y= -16/-4
y=4