9x + 5y = 28 5x + 9y = 56 the solution set for the system of equations is .

I think its associative property I believe if not then Im not so
 sure sorry.

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.