Question

Solve using elimination.
7x - 3y = 20
5x + 3y = 16
Is it (3, 1/3)?

Answer 1

is that what you got ?

Answer 2

what did you eliminate anyway?

Answer 3

Let's plug in,
$$
7\times\color{red}{ 3}-\cfrac{3}{\color{red}{3}}=21-1=20~\checkmark\\
5\times \color{red}{3} +\cfrac{3}{\color{red}{3}}=15+1=16~\checkmark\\
$$
Looks good!