What are like terms how can u combine them?

Like terms are terms that have the same variable degree.

For example, 3x and 10x are like terms because they both have x^1

2 and 4 are also like terms because they both have x^0

Step-by-step explanation:

ok then what happened.

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.