How do i solve this question to get my value of x ?

On number 10, they are alternate interior angles, which means they are congruent. So you would set it up as x+25=85. After working that out you should get x=60. On number 11, they are supplementary angles which means if they are added together they will equal 180. Your equation is 65+5x=180. After you solve that you should get x=23.

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.