Use substitution to solve the system of equations.
-1=2x-y
8x-4y=-4

15 points ! ~ see if you know the answer to both you!

Twenty points. suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet

Y+ 2/y is it a polynomial in one variable or not? and if so, why?