Find the area of the surface of the half cylinder startset left parenthesis r comma theta comma z right parenthesis : r equals 4 comma 0 less than or equals theta less than or equals pi comma 0 less than or equals z less than or equals 9 endset using a parametric description of the surface.

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

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