You are tiling a 1 square metre bathroom with 10cm square tiles. The exact number of the tiles needed is yet unknown because you
may break some tiles and will have to cut some of them to fit around the corners. Therefore, you work to the rule of thumb that you should buy enough tiles to cover specified area plus 10%. Derive a linear equation for the cost of y for the number of tiles x to be bought. The correct linear equation is?
