11 . C
One of the steps in solving this equation is to square both sides. That step can result in
“extraneous” solutions. Look:But if you plug those solutions back into the original equation, you’ll find that x = −6 doesn’t
work. The only solution is x = −1.Alternatively, you could Backsolve using the numbers provided in the answer choices.12 . B
You can think this one through conceptually: The first equation intercepts the y-axis at (0, 4),
and the second equation intercepts the y-axis at (0, 3). That they intersect to the right of the
y-axis means that the x-coordinate of the point of intersection is positive: