Sketch the following systems and find any real solutions: (a) x2 + y2 = 25 and x2 - y2 = 7 (b) 16x2 + 9y2 = 144 and y = x2 + 5
HINT:
(a) is a circle and a hyperbola, (b) is a parabola and an ellipse. Sketch the graphs first to see if they intersect, then solve by substitution or elimination if they do.