This system of equations has A. exactly one solution B. no solution C. infinitely many solution PLZ HURRY

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?

Is the square root of 4 plus the square root of 16 rational?