Please provide Justified solution for each part asap to get a upvote

4. If y2 = 1 is another solution to the differential equation of problem 3, is y = 31 + 12 a solution too? (a) yes (b) No 5. Check if the functions e", cosh(r), sinh(x) are linearly independent. (a) yes (b) No 6. Check if the functions 0, sin(x), et are linearly independent. (a) yes (b) No 7. Check if the functions 2r, 3x3, 5x - 8 are linearly independent. (a) yes (b) No 8. Check if the functions , p3, x3 - x2 are linearly independent. (a) yes (b) No 9. Find the highest point of the solution curve of (y" + 3y' + 2y = 0 (a) (-2,2) y(0) = 1 y'(0) =6 (b) (In ], 15) (c) (.1) (d) (0,0)