9.5 Practice Solve each nonlinear system of equations. Give all solutions. Substitution 15. x2 y = 0 x + y = 2 19. y = x3 + 4x 2x y = 8 Elimination 2.3. x3 + i2 = x2 _ )'l = 0 16. x2 + i o u x y=0 20. y=6x+x3 4x_\\'=3 30. 3x2 + 5)'3 = I? 2x3 3s2 = 25. 512 - y: = 0 3x3 + 4y2 = 0 31. 2x3 + 2)'3 = 20 4x3 + 4": = 30 26. x3 + y! = 2x2 - 3y= = 0