Show that each of the following equations is equivalent to 0.9c +1.89r=17.01. Then, explain when it might be helpful to write the equation in these forms. c=18.9-2.1r

r= -1021c+9

The first floor of marcus’ house is 1,440 square feet. he will cover 1,033 square feet with wood and the rest with tile. a box of tiles will cover 11 square feet. how many boxes of tile does marcus need to buy to cover the floor?