Solve this system of equations
{y=2x
X=-y+6

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible

Select the two pairs of figures that are similar.

Tanyss's house has 25 windows. her brother has washed 22 of the windows. what percent of the windows has her brother washed?