
Simple EquationsThe line x+3y=1 intersects the curve x^2  xy + y^2 = 21 at the points A and B. Both the line and the curve have the same coordinates at the points A and B. x + 3y = 1 => x = 1  3y Substitute...

Simple Equationsfor this one you can solve this in many ways. (x+2)^3 = (x+2)(x+2)(x+2) > foil out the the first two factors = (x^2 + 4x + 4) (x+2) then distribute the thir factor...