you overhear your friend explaining how to find intercepts to a classmate. Your friend says, When you want find x-intercept, just substitute 0 for x and continue to solve the equation. Is your friends explanation correct ?

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.

i dont know the answer but here's a picture of a dog