What is slope and y-intercect of a vertical line? (that's all to the question)

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Ineed with angles and the measure of them i have abc a is 65 and b is (3x-10) and c is (2x) find the value of x