Help me please i would die of happiness

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

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?

An isosceles trapezoid with a perimeter of 42 inches. each of the congruent non parallel sides is 5 inches long, and the trapezoid is 3 inches tall. how long are the two parallel sides? a. 10 in, 22 in b. 16 in, 16 in c. 10 in, 16 in d. 12 in, 20 in