8) Select the best method to solve the system. -x+y=5
2x-5y=12

*elimination
*substitution

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions. a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out

Here is another math questions. i will keep asking different questions. 4^2x=6