Find the slope of the line.
9x + y=9

Step-by-step explanation:

9x+y=9

y=-9x+9

comparing with y=mx+c

slope (m)=-9

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540