- Mrs. Hall wants to carpet the rectangular floor of her
living room. Carpeting is sold
by the square yard. If her
living room floor measures 18
feet by 24 feet, how many
square yards of carpeting will
Mrs. Hall have to buy in order
to cover the living room floor
wall-to-wall?

If you would like to find the other half of the coordinate, you can calculate this using the following steps:

(x, y) = (2, ?)
x = 2
y = ?

4 * x - 5 * y = - 7
4 * 2 - 5 * y = - 7
8 - 5 * y = - 7
8 + 7 = 5 * y
15 = 5 * y      /5
y = 15 / 5
y = 3

The correct result would be y = 3.