What is the value of x in the triangle

How do you solving the solution of each system using elimination?

Lines a and b are parallel. what is the value of x? -5 -10 -35 -55

The evening newspaper is delivered at a random time between 5: 30 and 6: 30 pm. dinner is at a random time between 6: 00 and 7: 00 pm. each spinner is spun 30 times and the newspaper arrived 19 times before dinner. determine the experimental probability of the newspaper arriving before dinner.