Do you know how to divide these numbers

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

Anumber is equal to twice a smaller number plus 3. the same number is equal to twuce the sum of the smaller number and 1. how many solutions are possible for this situation