Remember that this type of problem can also be solved by Picking Numbers.9 . B
With only two equations, you won’t be able to get numerical solutions for three unknowns.
But apparently you can get far enough to rule out four of the five answer choices. How? Look
for a way to combine the equations that leads somewhere useful. Notice that the first
equation contains −rt and the second equation contains +rt, so if you add the equations as
they are, you’ll lose those terms:There’s not enough information to get numerical solutions for r or t, but you do know that q
= 19, so the correct answer is the only choice that has q = 19.10 . C
If the absolute value of something is less than , then that something is between and
:
Thus, There are nine integers in that range: −7, −6, −5, −4, −3, −2, −1, 0,
and 1.