−4x + y = 6
−5x − y = 21

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

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.

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?