How many diagonals does a cube have

A cube has 4 "space" diagonals or diagonals within the cube's interior. 

On its surface, a cube has 12 "face" diagonals, 2 per each of its six congruent square faces.

So the total number of diagonals is 4 + 12 = 16

fa tha first one you gonna add y to both sides

it look like this

x-y+y=6+y

x=y+6

therefore your answer is

x =y+6

fa tha second one

you gonna flip tha equation

it gonna look like x-4y=y

then add 4 to both sides

it gonna look like tha

x-4 +4 =y +4

so therefore tha answer is x=y+4

step-by-step explanation: