There are 278 math and science books. 128 of them are math books. how many science books are there?

150

Step-by-step explanation:

278-128=150

i think asking google will you get the answer to that question

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.