Question

Select all ordered pairs that satisfy the function y=4x+3.

Answer 1

I suppose that you should have given some pairs to choose from.

Anyway, I can tell you how to do it. Given a pair $(a,b)$, you have to substitute $a$ and $b$ to $x$ and $y$ respectively, and see if you get something true.

For example, the pair $(1,7)$ satisfies the function, because the substitution yields

$7=4\cdot 1+3$

which is true. On the other hand, the pair $(19,3)$ doesn't satisfy the function, because

$3=4\cdot 19+3$

is clearly false.