A book 28 cm tall leans against the sidewall of a bookcase. The bottom of the book starts to slide away from the wall at a rate of 2 cm/sec. How fast is the top of the book moving down the wall when the bottom of the book is 12 cm from the wall?

we have the same question :(

Step-by-step explanation:

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: