-3.5 + x7= -5.2

pls answer

Need this asap if anyone can i would be very grateful. if you could show workings that would really

Which equation represents a line that passes through the point (9, -4) and has a slope of 3/5?

Walter is to make cookies for a basketball tournament. he's made 15 cookies so far. his coach asked him to make at least 20 cookies but no more than 55. solve the inequality and interpret the solution. 20 ? x + 15 ? 55