When carlos had one dog, he needed to serve 1/3 can of dog food\ each day, he adopted another dog and now he needs to serve a total of 5/6 can of dog food each day, how much extra does he have to feed his dogs now

an extra 1/2 can

Step-by-step explanation:

if you change 1/3 into 2/6, you can see that he originally fed 2/6 of a can and now feeds 5/6 meaning that not he feeds an extra 3/6 which simplifies into 1/2

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

umumumumum

im not sure