Will mark brainliest and rate 5 stars, , 50 points explain in detail what to do next: solve the system of equations algebraically. show all of your steps. y=x^2+2x y=3x+20 first, i combined both equations: 3x+20=x^2+2x next, i subtracted 2 from each side: 1x+20=x^2 don't know what to do now.

You're using inverse operation to solve this equation. Now you just have to think about it. What number plus 20 would equal the same number squared? The answer would be 5, since
5+20=5^2
25=25
 The statement above is true :)
Another number that would work for the equation would be x= -4
-4+20=-4^2
16=16
The statement above is also true so your answer would be x=-4 and 5