Find the solution of the system of equations
8x + 7y = 47
-4x - 5y = -25

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (-1+i)+(21+5i)+0

Joe has a rectangular chicken coop. the length of the coop is 4 feet less than twice the width. the area of the chicken coop is 510 square feet. what is the length of the chicken coup?

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