Please help with how I am supposed to do this. D:

Create an inequality:

17+2x>25

(x is the number of goldfish he bought)

Simplify:

2x>8

x>4

Graph is by making a point on the line at 4 with an open circle and include the numbers larger than it (to the right of 4 on the line)

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.